Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Statement of Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent After Tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Net unrealized gains (losses) on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Net changes in securities held to maturity Other Comprehensive Income (Loss), Securities Transferred To Held To Maturity Adjustment, Net Of Tax, Portion Attributable To Parent Other Comprehensive Income (Loss), Securities Transferred To Held To Maturity Adjustment, Net Of Tax, Portion Attributable To Parent Net unrealized gains (losses) on cash flow hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other Other Comprehensive Income Other, Net Of Tax, Attributable To Parent Other Comprehensive Income Other, Net Of Tax, Attributable To Parent Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Net Unrealized Investment Gain (Loss) Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Cash Flow Hedges Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Other Accumulated Other Comprehensive Income (Loss), Other Component [Member] Accumulated other comprehensive income or loss from pension, other postretirement benefit plans, and others. Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Available-for-sale Securities Available-for-sale Securities [Member] Securities Held to Maturity Held-to-maturity Securities [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI beginning balance Accumulated Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Net realized (gains) losses reclassified from AOCI into earnings Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Other comprehensive income (loss), net of tax AOCI ending balance Receivables [Abstract] Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating Segments [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Commercial Banking Commercial Banking [Member] Consists of lending, deposit gathering and treasury management services to commercial real estate and middle market customers. Our Commercial Banking business results also include the results of a national portfolio of small ticket commercial real-estate loans that are in run-off mode. Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial Banking Commercial Portfolio Segment [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Loans Receivable Loans Receivable [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Commercial and multifamily real estate Commercial And Multifamily Real Estate [Member] Property that is used for business purposes or multifamily residential. Commercial and industrial Commercial And Industrial [Member] Commercial and industrial. Small-ticket commercial real estate Small Ticket Real Estate [Member] Loans issued to businesses to acquire, develop, construct, improve, or refinance land or a building. Includes but is not limited to commercial mortgage loans and construction financing. Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic Concentration Risk Geographic Concentration Risk [Member] Internal Risk Rating Concentration Risk Internal Risk Rating Concentration Risk [Member] Internal Risk Rating Concentration Risk [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Northeast Northeast [Member] Northeast US region. Mid-Atlantic Mid Atlantic [Member] Mid-Atlantic US region. South South [Member] South US region. Other Other States [Member] Other states not individually listed. Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Noncriticized Pass [Member] Criticized Criticized [Member] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Criticized performing Performing Financial Instruments [Member] Criticized nonperforming Nonperforming Financial Instruments [Member] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality [Member] Receivables Acquired with Deteriorated Credit Quality [Member] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Loans held for investment Loans and Leases Receivable, Gross Percentage of portfolio Concentration Risk, Percentage Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] U.S. Treasury securities US Treasury Securities [Member] RMBS Residential Mortgage Backed Securities [Member] CMBS Commercial Mortgage Backed Securities [Member] Other ABS Other Asset-backed Securities [Member] Other Asset-backed Securities [Member] Other securities Other Debt and Equity Securities [Member] Other Debt and Equity Securities [Member] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] Agency Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Non-Agency Mortgage-backed Securities, Issued by Private Enterprises [Member] Product Concentration Risk [Member] Product Concentration Risk [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Investment securities available for sale: Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract] Total Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Securities available for sale, at fair value Available-for-sale Securities Non-credit OTTI losses related to non-agency RMBS Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Operating Segments Other Corporate, Non-Segment [Member] Credit Card Credit Card [Member] Credit card portfolio segment. Consumer Banking Consumer Banking [Member] Consists of our branch-based lending and deposit gathering activities for small business customers, as well as branch-based consumer deposit gathering and lending activities, national deposit gathering, national automobile lending, consumer mortgage lending and servicing activities. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net interest income Interest Income (Expense), Net Non-interest income Noninterest Income Total net revenue Revenues Provision for loan, lease and other losses Provision for Loan, Lease, and Other Losses Total non-interest expense Noninterest Expense Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax provision (benefit) Income Tax Expense (Benefit) Income from continuing operations, net of tax Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Total deposits Deposits Effective income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Changes in Accretable Yield of Acquired Securities [Roll Forward] Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Accretable yield beginning balance Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Additions from new acquisitions Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Additions Accretion recognized in earnings Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion Reduction due to payoffs, disposals, transfers and other Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Disposals of Loans Net reclassifications from (to) nonaccretable difference Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Reclassifications from (to) Nonaccretable Difference Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Reclassifications from (to) Nonaccretable Difference Accretable yield ending balance Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Letter of Credit and Other Loan Commitments [Table Text Block] Schedule of letter of credit and other loan commitments [Table Text Block] Schedule of letter of credit and other loan commitments [Table Text Block] Loans Loans, Notes, Trade and Other Receivables, Excluding Allowance for Credit Losses [Text Block] Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Restricted cash for securitization investors Restricted Cash and Cash Equivalents, Fair value Disclosure Restricted Cash and Cash Equivalents, Fair value Disclosure Securities held to maturity Held-to-maturity Securities, Fair Value Net loans held for investment Loans Receivable, Fair Value Disclosure Loans held for sale Loans Held-for-sale, Fair Value Disclosure Interest receivable Interest Receivable, Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure and may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents interest earned but not received as of the balance sheet date. Other investments Cost Method Investments, Fair Value Disclosure Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Deposits Deposits, Fair Value Disclosure Securitized debt obligations Secured Debt, Fair Value Disclosure Secured Debt, Fair Value Disclosure Senior and subordinated notes Unsecured Debt, Fair Value Disclosure Unsecured Debt, Fair Value Disclosure Federal funds purchased and securities loaned or sold under agreements to repurchase Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Other borrowings Other Borrowings Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure and may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents the aggregate of other miscellaneous borrowings owed by the company as of the balance sheet date. Interest payable Interest Payable Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure and may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents accrued interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid as of the balance sheet date. Derivative Instruments and Hedging Activities Disclosure [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Derivatives designated as accounting hedges Designated as Hedging Instrument [Member] Derivatives not designated as accounting hedges Not Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate contracts Interest Rate Contract [Member] Foreign exchange contracts Foreign Exchange Contract [Member] Other contracts Other Contract [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Fair value hedges Fair Value Hedging [Member] Cash flow hedges Cash Flow Hedging [Member] Net investment hedges Net Investment Hedging [Member] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] MSRs Mortgage Servicing Rights Interest Rate Contracts [Member] Derivative instruments not designated as hedges used to offset changes in the fair value of mortgage servicing rights attributable to interest rate fluctuations. Customer accommodation Customer Accommodation Interest Rate Contracts [Member] Customer oriented interest rate derivatives not designated as hedging instruments. Other interest rate exposures Other Interest Rate Exposures Interest Rate Contracts [Member] Non-customer oriented interest rate derivatives not designated as hedging instruments. Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Cumulative counterparty credit risk valuation adjustment Derivative Credit Risk Valuation Adjustment, Derivative Assets Notional or Contractual Amount Derivative, Notional Amount Derivative Assets, Gross Amount Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Derivative Liabilities, Gross Amount Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement Derivative Asset, Netting Adjustment Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Derivative Liability, Netting Adjustment Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset Derivative Assets Derivative Asset Derivative Liability Derivative Liability Cumulative credit risk valuation adjustment related to our credit quality (less than $1 million Derivative Credit Risk Valuation Adjustment, Derivative Liabilities Increase in derivative assets due to CME Rulebook change Decrease/(increase) in derivative assets due to CME Rulebook change Decrease /(increase) in derivative assets due to CME Rulebook change Decrease in derivative liabilities due to CME Rulebook change Decrease in derivative liabilities due to CME Rulebook change Decrease in derivative liabilities due to CME Rulebook change Mergers, Acquisitions, Restructuring and Dispositions Disclosures [Abstract] Mergers, Acquisitions, Restructuring and Dispositions Disclosures [Abstract] Business Developments and Discontinued Operations Mergers, Acquisitions, Restructuring and Dispositions Disclosures [Text Block] Mergers, Acquisitions, Restructuring and Dispositions Disclosures [Text Block] Schedule of Preferred Stock Schedule of Stock by Class [Table Text Block] Change in AOCI Gain (Loss) by Component (Net of Tax) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassifications from AOCI Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Components of Other Comprehensive Income (Loss) and Related Tax Impact Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Letter of Credit [Member] Letter of Credit [Member] Credit Card Portfolio Segment [Member] Credit Card Portfolio Segment [Member] Credit Card Portfolio Segment [Member] Other Portfolio Segments, Excluding Credit Card Other Portfolio Segments, Excluding Credit Card [Member] Other Portfolio Segments, Excluding Credit Card [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Unused Commitments to Extend Credit Unused Commitments to Extend Credit Letter of Credit Issued Contractual Amount and Unused Commitment to Extend Credit Letter of credit issued contractual amount and unused commitment to extend credit Letter of credit issued contractual amount and unused commitment to extend credit Off-balance Sheet Lending Commitment Carrying Value off-balance sheet lending commitment carrying value The carrying value of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees), which represents the allowance for lending-related commitments, deferred revenue and the guarantee liability. Advised Line of Credit Advised Line of Credit The contractual amount of line of credit that drawings are subject to our satisfactory evaluation of the customer and are cancelable upon proper notice. Deposits and Borrowings [Abstract] Deposits and Borrowings [Abstract] Components of Deposits, Short-term Borrowings and Long-term Debt Schedule of Debt [Table Text Block] Schedule of Maturity Profile of Borrowings and Debt Schedule of Maturities of Time Deposits with Contractual Maturity Date Short Term Debt and Long term Debt [Table Text Block] [Table Text Block] for Schedule of Maturities of Time Deposits with Contractual Maturity Date Short Term Debt and Long term Debt [Table] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Available-for-sale Securities Corporate debt securities guaranteed by U.S. government agencies US Government-sponsored Enterprises Debt Securities [Member] Consumer MSRs Servicing Contracts [Member] Retained interest in securitizations Retained Interest [Member] Net derivative assets (liabilities) Net Derivative Assets (Liabilities) [Member] Net Derivative Assets (Liabilities) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total Gains or (Losses) (Realized/Unrealized), Included in Net Income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Total Gains or (Losses) (Realized/Unrealized), Included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Transfers Out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Ending balance Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Geographic Distribution [Axis] Geographic Distribution [Axis] Geographic Distribution [Domain] Geographic Distribution [Domain] Geographic Distribution, Domestic [Member] Geographic Distribution, Domestic [Member] Geographic Distribution, Foreign [Member] Geographic Distribution, Foreign [Member] California CALIFORNIA Texas TEXAS New York NEW YORK Florida FLORIDA Illinois ILLINOIS Pennsylvania PENNSYLVANIA Ohio OHIO New Jersey NEW JERSEY Michigan MICHIGAN Canada CANADA United Kingdom UNITED KINGDOM Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2017-12 Accounting Standards Update 2017-12 [Member] Accounting Standards Update 2017-12 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Operating Leases, Future Minimum Payments Due Operating Leases, Future Minimum Payments Due Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings, tax effect Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect Amount of increst (decrease) in accumulated other comprehensive incom (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017 Securities held to maturity, at carrying value Held-to-maturity Securities Accumulated other comprehensive loss Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, Beginning Balance Goodwill Goodwill, Acquired During Period Goodwill, Acquired During Period Other adjustments Goodwill, Other Increase (Decrease) Goodwill, Ending Balance Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company Parent Company [Member] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Equity in undistributed earnings of subsidiaries Equity in undistributed Net Income including Discontinued Ops Equity in undistributed Net Income (loss) of subsidiaries and Net income (loss) from Discontinued Ops Attributable to Parent Other operating activities Other Operating Activities, Cash Flow Statement Net cash from operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Net payments (to) from subsidiaries Increase (Decrease) in Investment in Subsidiaries Increase (Decrease) in Investment in Subsidiaries Proceeds from paydowns and maturities of securities available for sale Proceeds from Sale and Maturity of Available-for-sale Securities Purchase of securities available for sale Payments to Acquire Available-for-sale Securities Changes in loans to subsidiaries Increase (Decrease) in Loans to Subsidiaries Increase (Decrease) in Loans to Subsidiaries Net cash from investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Changes in borrowings from subsidiaries Increase (Decrease) in Borrowings From Subsidiaries Increase (Decrease) in Borrowings From Subsidiaries Proceeds from issuance of senior notes and sub notes Proceeds from issuance of senior notes and sub notes Proceeds from issuance of senior notes and sub notes Proceeds from paydowns and maturities of senior and subordinated notes Maturities of Senior Debt Common Stock Common Stock, Financing Activities [Abstract] Common Stock, Financing Activities [Abstract] Net proceeds from issuances Proceeds from Issuance of Common Stock Dividends paid Payments of Ordinary Dividends, Common Stock Preferred Stock Preferred Stock, Financing Activities [Abstract] Preferred Stock, Financing Activities [Abstract] Net proceeds from issuances Proceeds from Issuance of Preferred Stock and Preference Stock Dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Purchases of treasury stock Payments for Repurchase of Common Stock Proceeds from share-based payment activities Proceeds from Stock Plans Net cash from financing activities Net Cash Provided by (Used in) Financing Activities Changes in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash, cash equivalents and restricted cash for securitization investors, beginning of the period Cash, Cash Equivalents, and Federal Funds Sold Cash, cash equivalents and restricted cash for securitization investors, ending of the period Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Summary of Stock Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Stock Options Cash Flow Impact Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block] Weighted Average Assumptions Used to value Stock Options Granted Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of Activity for Restricted Stock Awards and Units Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Activity for Performance Share and Performance Units Share-based Compensation, Performance Shares and Performance Units Award Unvested Activity [Table Text Block] Share-based Compensation, Performance Shares and Performance Units Award Unvested Activity [Table Text Block] Derivative liabilities(1)(2) Offsetting Derivative Liabilities [Abstract] Derivative Liability, Offsetting Financial Instruments Derivative Liability, Fair Value, Gross Asset Derivative Liability, Offsetting Cash Collateral Derivative Liability, Collateral, Right to Reclaim Cash, Offset Derivative Liability, Securities Collateral Not Netted Derivative Liability, Fair Value of Collateral Net Exposure Derivative Liability, Fair Value, Amount Offset Against Collateral Repurchase agreements(3) Offsetting Securities Sold under Agreements to Repurchase [Abstract] Gross Amounts Securities Sold under Agreements to Repurchase, Gross Securities Sold under Agreements to Repurchase, Asset Securities Sold under Agreements to Repurchase, Asset Repurchase Agreement, Collateral, Right To Reclaim Cash, Offset Repurchase Agreement, Collateral, Right To Reclaim Cash, Offset Repurchase Agreement, Collateral, Right To Reclaim Cash, Offset Net Amounts as Recognized Securities Sold under Agreements to Repurchase Offsetting Amounts Not Netted, Collateral Pledged Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities Net Exposure Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral Securities Sold under Agreements to Repurchase, Fair Value of Collateral Securities Sold under Agreements to Repurchase, Fair Value of Collateral Derivative, Collateral, Obligation to Return Cash Derivative, Collateral, Obligation to Return Cash Derivative, Collateral, Obligation to Return Securities Derivative, Collateral, Obligation to Return Securities Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Right to Reclaim Cash Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series B Preferred Stock Series B Preferred Stock [Member] Series C Preferred Stock Series C Preferred Stock [Member] Series D Preferred Stock Series D Preferred Stock [Member] Series E Preferred Stock Series E Preferred Stock [Member] Series F Preferred Stock Series F Preferred Stock [Member] Series G Preferred Stock Series G Preferred Stock [Member] Series H Preferred Stock [Member] Series H Preferred Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Depository Share, Percent Interest in Preferred Stock Depository Share, Percent Interest in Preferred Stock Depository Share, Percent Interest in Preferred Stock Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Percentage Redemption Price per Depositary Share (in dollars per share) Preferred Stock, Redemption Price Per Share Number of Depositary Shares (in shares) Preferred Stock, Depositary Shares Issued Preferred Stock, Depositary Shares Issued Preferred Stock, Including Additional Paid in Capital, Net of Discount Preferred Stock, Including Additional Paid in Capital, Net of Discount Preferred Stock, Dividend Payment Rate, Variable Preferred Stock, Dividend Payment Rate, Variable Preferred Stock Dividend Rate, Variable Dividend Basis Spread On Variable Rate The percentage points added to the reference rate to compute the dividend rate. Loan Portfolio Composition and Aging Analysis Past Due Financing Receivables [Table Text Block] 90 Plus Day Delinquent Loans Accruing Interest and Nonperforming Loans Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Consumer Portfolio Segment [Member] Consumer Portfolio Segment [Member] Home loan Residential Mortgage [Member] Schedule of Concentration Risk, by Risk Factor, Including Delinquency and Performing Status Schedules of Concentration of Risk, by Risk Factor, Including Delinquency and Performing Status [Table Text Block] Schedules of Concentration of Risk by Risk Factor Including Delinquency and Performing Status [Table Text Block] Schedule of Net Charge-Offs Schedule of Net Charge-Offs and Nonperforming Loans [Table Text Block] Schedule of Net Charge-Offs and Nonperforming Loans [Table Text Block] Schedule of Concentration of Risk, by Risk Factor Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Individually Impaired Loans, Excluding Acquired Loans Impaired Financing Receivables [Table Text Block] TDR Disclosures in Progress Financial Impact of Modification Troubled Debt Restructurings on Financing Receivables [Table Text Block] Outstanding Balance and Carrying Value of Acquired Loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block] Changes in Accretable Yield on Acquired Loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Table Text Block] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Level 3 Inputs Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Quantitative Information Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Schedule of Assets Measured at Fair Value on Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Schedule of Earnings Related to Assets Measured at Fair Value on Nonrecurring Basis Fair Value Assets Measured On Non Recurring Basis Gain Loss Included In Earnings [Table Text Block] Fair Value Assets Measured On Non Recurring Basis Gain Loss Included In Earnings [Table Text Block] Schedule of Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Accounting Policies [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Buildings and improvements Building and Building Improvements [Member] Furniture and equipment Furniture And Equipment [Member] Long lived, depreciable assets, commonly used in workplaces and equipment not directly used in the production process for inventories or facilities. Computers and software Software and Software Development Costs [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Useful Lives, years Property, Plant and Equipment, Useful Life Variable Interest Entities and Securitization [Abstract] Variable Interest Entities and Securitization [Abstract] Qualitative and Quantitative Information, Transferor's Continuing Involvement [Table] Qualitative and Quantitative Information, Transferor's Continuing Involvement [Table] Qualitative and Quantitative Information, Transferor's Continuing Involvement, Transferred Financial Assets, by Transfer or Transferee [Axis] Qualitative and Quantitative Information, Transferor's Continuing Involvement, Transferred Financial Assets, by Transfer or Transferee [Axis] Qualitative and Quantitative Information, Transferor's Continuing Involvement in Transferred Financial Assets, Transfer or Transferee [Domain] Qualitative and Quantitative Information, Transferor's Continuing Involvement in Transferred Financial Assets, Transfer or Transferee [Domain] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Option- ARM Option Arm [Member] Presentation of information regarding securitization programs containing mortgage option arm loan receivables. GreenPoint HELOCs Gpm Helocs [Member] Presentation of information regarding securitization programs containing home equity line of credit loan receivables. GPMH [Member] GPMH [Member] GPMH [Member] Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] Securities held by third-party investors, non-mortgage Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Liabilities Incurred Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Liabilities Incurred Securities held by third-party investors, mortgage Continuing Involvement with Derecognized Transferred Financial Assets, Liabilities Incurred Continuing Involvement with Derecognized Transferred Financial Assets, Liabilities Incurred Receivables in the trust, non-mortgage Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding Receivables in the trust, mortgage Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding Cash balance of spread or reserve accounts, non-mortgage Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Cash Balance in Spread and Reserve Accounts Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Cash Balance in Spread and Reserve Accounts Cash balance of spread or reserve accounts, mortgage Continuing Involvement with Derecognized Transferred Financial Assets, Cash Balance of Reserve or Spread Accounts Continuing Involvement with Derecognized Transferred Financial Assets, Cash Balance of Reserve or Spread Accounts Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Performing Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Reduced Interest Rate Contractual Interest Rate Reduction [Member] Term Extension Extended Maturity [Member] Balance Reduction Principal Forgiveness [Member] Auto Automobile Loan [Member] Retail banking Retail Banking [Member] Any loan or extension of credit to an individual for personal, family, or household. Total commercial lending Commercial Lending [Member] Commercial Lending [Member] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Total Loans Modified Financing Receivable, Modifications, Post-Modification Recorded Investment % of TDR Activity Financing Receivable, Modifications, Percentage of Troubled Debt Restructuring Activity Financing Receivable, Modifications, Percentage of Troubled Debt Restructuring Activity Average Rate Reduction Financing Receivable, Modifications, Average Rate Reduction Financing Receivable, Modifications, Average Rate Reduction Average Term Extension (Months) Financing Receivable, Modifications, Average Term Extension Financing Receivable, Modifications, Average Term Extension Gross Balance Reduction Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down Amortization of Intangible Assets Amortization of Intangible Assets Actual for the year ended Amortization [Abstract] Estimated future amounts for the year ended December 31, Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2018 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Net Carrying Amount Finite-Lived Intangible Assets, Net Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Minimum [Member] Maximum [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Securitized debt obligations Secured Debt [Member] Total senior and subordinated notes Senior And Subordinated Notes [Member] Senior and subordinated notes. Senior notes Senior Notes [Member] Subordinated notes Subordinated Debt [Member] FHLB advances Federal Home Loan Bank Advances [Member] Capital Lease Obligation and GPMH Capital Lease Obligation and GPMH [Member] Capital Lease Obligation and GPMH [Member] FHLB Advance and Capital Lease Obligation FHLB Advance and Capital Lease Obligation [Member] FHLB Advance and Capital Lease Obligation Combined Member FHLB Advance Capital Lease Obligation and GPMH FHLB Advance Capital Lease Obligation and GPMH [Member] FHLB Advance Capital Lease Obligation and GPMH Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total unsecured senior debt Unsecured Senior Debt [Member] Unsecured senior debt. Fixed unsecured senior debt Fixed Unsecured Senior Debt [Member] Fixed unsecured senior debt. Floating unsecured senior debt Floating Unsecured Senior Debt [Member] Floating unsecured senior debt. Fixed unsecured subordinated debt Fixed Unsecured Subordinated Debt [Member] Fixed unsecured subordinated debt. Debt Instrument [Line Items] Debt Instrument [Line Items] Time Deposits, at or Above FDIC Insurance Limit Time Deposits, at or Above FDIC Insurance Limit Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Weighted average interest rate Long-term Debt, Weighted Average Interest Rate, at Point in Time Long-term debt Long-term Debt Long-term Debt and Capital Lease Obligations Long-term Debt and Capital Lease Obligations Debt and Capital Lease Obligations Debt and Capital Lease Obligations Fair Value Inputs, Assets, Quantitative Information [Table] Fair Value Inputs, Assets, Quantitative Information [Table] Foreign government bonds Foreign Government Debt Securities [Member] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Discounted cash flows Income Approach Valuation Technique [Member] Weighted Average Weighted Average [Member] Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair Value Inputs, Assets, Quantitative Information [Line Items] Securities available for sale Consumer MSRs Servicing Asset at Fair Value, Amount Retained interests in securitizations Retained Interest, Fair Value Disclosure Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Fair Value Inputs [Abstract] Fair Value Inputs [Abstract] Yield (percent) Fair Value Inputs, Interest Rate Correlation Interest rate correlation, used as an input to measure fair value. Life of receivables (months) Fair Value Inputs, Life of Receivables Fair Value Inputs, Life of Receivables Voluntary prepayment rate (percent) Fair Value Inputs, Prepayment Rate Default rate (percent) Fair Value Inputs, Probability of Default Loss severity (percent) Fair Value Inputs, Loss Severity Total prepayment rate (percent) Fair Value Inputs, Total Prepayment Rate Rate at which loans or a loan portfolio are expected to prepay principal balances with consideration of defaults, used as an input to measure fair value Discount rate (percent) Fair Value Inputs, Discount Rate Option adjusted spread rate (percent) Fair Value Inputs, Option Adjusted Spread Rate Fair Value Inputs, Option Adjusted Spread Rate Servicing cost ($ per loan) Fair value Inputs, Servicing Cost Per Loan Fair value Inputs, Servicing Cost Per Loan Swap rates (percent) Fair Value Inputs, Swap Rate Fair value inputs, swap rate. Earnings Per Share [Abstract] Schedule of Computation of Basic and Diluted Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Business Segments Segment Reporting Disclosure [Text Block] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] Outstanding balance Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance Carrying value Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Financing Receivable, Allowance for Credit Losses Financing Receivable, Allowance for Credit Losses Provision for credit losses for Acquired Loans Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) Deposits and Borrowings Debt and Deposit Liabilities Disclosures [Text Block] Information about short-term and long-term debt arrangements, including amounts of borrowings, repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements. Also includes the entire disclosure for deposit liabilities including data and tables. Restructuring Charges Restructuring Charges Restructuring Reserve Restructuring Reserve Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Voting Interest Entities Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Equity and Cost Method Investments Equity and Cost Method Investments, Policy [Policy Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Securities Resale and Repurchase Agreements Repurchase and Resale Agreements Policy [Policy Text Block] Investment Securities Marketable Securities, Policy [Policy Text Block] Loans Finance, Loans and Leases Receivable, Policy [Policy Text Block] Allowance for Loan and Lease Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Securitization of Loans Transfers and Servicing of Financial Assets, Transfers of Financial Assets, Policy [Policy Text Block] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Mortgage Servicing Rights Transfers and Servicing of Financial Assets, Servicing of Financial Assets, Policy [Policy Text Block] Foreclosed Property and Repossessed Assets Finance, Loan and Lease Receivables, Held for Investments, Foreclosed Assets Policy [Policy Text Block] Restricted Equity Investments [Policy Text Block] Restricted Equity Investments [Policy Text Block] Restricted Equity Investments [Policy Text Block] Litigation Loss contingincy related to litigation matters [Policy Text Block] Loss contingency related to litigation matters [Policy Text Block] Customer Rewards Reserve Customer Rewards Reserve [Policy Text Block] Customer Rewards Reserve Policy Text Block [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Stock-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Marketing Expense Advertising Costs, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Fair Value Fair Value of Financial Instruments, Policy [Policy Text Block] Accounting for Acquisitions Business Combinations Policy [Policy Text Block] New Accounting Standards Adopted New Accounting Pronouncements, Policy [Policy Text Block] Offsetting of Financial Assets and Liabilities Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block] Available-for-sale Securities, Gross Unrealized Loss Available-for-sale Securities, Gross Unrealized Loss Less than 12 Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 Months, Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 Months or Longer, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 Months or Longer, Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Loss Sharing Agreement Loss Sharing Agreement [Member] Loss Sharing Agreement [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Insurance Claims [Member] Insurance Claims [Member] Guarantee Obligation Guarantor Obligations, Current Carrying Value Loss contingency accrual Loss Contingency Accrual Loss accrual increase (decrease) Loss Contingency Accrual, Period Increase (Decrease) Loss Contingency, Range of Possible Loss, Portion Not Accrued Loss Contingency, Range of Possible Loss, Portion Not Accrued Income Statement [Abstract] Interest income: Interest and Dividend Income, Operating [Abstract] Loans, including loans held for sale Interest and Fee Income, Loans and Leases Investment securities Interest and Dividend Income, Securities, Operating Other Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Deposits Interest Expense, Deposits Securitized debt obligations Interest Expense, Secured Debt Interest Expense, Secured Debt Senior and subordinated notes Interest Expense, Unsecured Debt Interest expense incurred during the reporting period on senior and subordinated notes. Other borrowings Interest Expense Other Borrowings Interest expense incurred during the reporting period on other borrowings. Total interest expense Interest Expense Net interest income Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Non-interest income: Noninterest Income [Abstract] Interchange fees, net Interchange Fees, Net Revenues earned from switch fees charged to financial institutions for accessing our network to process transactions and other fees, net of reward costs. Service charges and other customer-related fees Service Charges and Other Customer-Related Fees Amount of income earned from loan services (including debt and credit protection, over limit, membership and annual fees). Excludes interest income earned on credit card balances and transactions. Gain (Loss) on Sale of Securities, Net Gain (Loss) on Sale of Securities, Net Other Noninterest Income, Other Total non-interest income Non-interest expense: Noninterest Expense [Abstract] Salaries and associate benefits Labor and Related Expense Occupancy and equipment Occupancy, Net Marketing Marketing Expense Professional services Professional and Contract Services Expense Communications and data processing Communications and Information Technology Amortization of intangibles Other Other Noninterest Expense Total non-interest expense Income from continuing operations before income taxes Income tax provision Income from continuing operations, net of tax Income (loss) from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income Dividends and undistributed earnings allocated to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), excluding Preferred Stock Dividends, Basic Participating Securities, Distributed and Undistributed Earnings (Loss), excluding Preferred Stock Dividends, Basic Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Basic earnings per common share: Earnings Per Share, Basic [Abstract] Net income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Income (loss) from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Net income per basic common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share: Earnings Per Share, Diluted [Abstract] Net income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Income (loss) from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Net income per diluted common share (in dollars per share) Earnings Per Share, Diluted Dividends paid per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Table] Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Table] Schedule of expected maturity and weighted average yield of securities. Debt Security Category [Axis] Debt Security Category [Axis] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Line Items] Schedule Of Expected Maturity And Weighted Average Yield Of Securities [Line Items] Schedule of expected maturity and weighted average yield of securities line items. Schedule of Investment Portfolio Marketable Securities [Table Text Block] Schedule of Available-for-Sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Investment Securities Held to Maturity Held-to-maturity Securities [Table Text Block] Schedule of Available-for-Sale Securities in Gross Unrealized Loss Position Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Schedule of Contractual Maturities for Securities Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Gross Realized Gains and Losses on Sale of Available-for-Sale Securities Recognized in Earnings Schedule of Realized Gain (Loss) [Table Text Block] Schedule of Outstanding Contractual Balance and Carrying Value of Credit-Impaired Debt Securities Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Contractual Balance and Carrying Value [Table Text Block] Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Contractual Balance and Carrying Value Schedule of Changes in Accretable Yield of Acquired Securities Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement [Table Text Block] Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Goodwill [Member] Goodwill [Member] Impairment of Intangible Assets Impairment of Intangible Assets (Excluding Goodwill) Goodwill accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Goodwill impairment loss Goodwill, Impairment Loss Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Income Tax Disclosure [Abstract] Additional Information [Table] Income Tax Examination [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] State and Local Jurisdiction State and Local Jurisdiction [Member] Additional Information [Line Items] Income Tax Examination [Line Items] Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. Pre-tax earnings from foreign operations Income (Loss) from Continuing Operations before Income Taxes, Foreign Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Operating Loss Carryforwards Operating Loss Carryforwards Accrued interest and penalties expense (benefit) related to income taxes included in income tax expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Provisional liability accrued for repatriation of undistributed foreign earnings Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Undistributed Accumulated Earnings of Foreign Subsidiary, Provisional Unrecognized Deferred Tax Liability Amount of reasonable estimate for deferred tax liability not recognized on undistributed accumulated earnings of foreign subsidiary intended to be permanently reinvested outside country of domicile for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act of 2017. Undistributed earnings of foreign subsidiaries Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Existing Undistributed Accumulated Earnings of Foreign Subsidiary Amount of undistributed accumulated earnings of foreign subsidiary intended to be permanently reinvested outside country of domicile for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act of 2017 and no reasonable estimate is determined. Amount of unrecognized deferred tax liability, bad debt reserve for tax purposes of qualified lender Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender Bad debt reserve for tax purposes of qualified lender Bad Debt Reserve forTax Purposes of Qualified Lender Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) Amount of reasonable estimate for income tax expense (benefit) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Affordable Housing Tax Credits, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Affordable Housing Tax Credits, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Affordable Housing Tax Credits, Provisional Income Tax Expense (Benefit) Capital One Financial Corporation (Parent Company Only) Condensed Financial Information of Parent Company Only Disclosure [Text Block] Property, Plant and Equipment and Lease Commitments [Abstract] Property, Plant and Equipment and Lease Commitments [Abstract] Depreciation Depreciation, Nonproduction Total rent expenses from continuing operations Operating Leases, Rent Expense Minimum sublease rental income due in future years Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Representation and Warranty Liability [Member] Representation and Warranty Liability [Member] Representation and Warranty Liability [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Wholesale Mortgage Banking Unit [Member] Wholesale Mortgage Banking Unit [Member] Wholesale Mortgage Banking Unit [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income (loss) from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax provision (benefit) Discontinued Operation, Tax Effect of Discontinued Operation Income (loss) from discontinued operations, net of tax Loss Contingency, Loss in Period Loss Contingency, Loss in Period Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Allowance for Credit Losses on Financing Receivables Allowance for Credit Losses on Financing Receivables [Table Text Block] Schedule of Loss sharing arrangement impact Schedule of Loss sharing arrangement impact [Table Text Block] Schedule of Loss sharing arrangement impact [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Preferred Stock Preferred Stock [Member] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Treasury Stock Treasury Stock [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Stock Compensation Plan [Member] Stock Compensation Plan [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Stockholders' Equity Attributable to Parent Beginning balance (shares) Shares, Issued Comprehensive income Common Stock Dividends, Shares Common Stock Dividends, Shares Dividends, Common Stock Dividends, Common Stock Dividends, Share-based Compensation, Stock Dividends, Share-based Compensation, Stock Cash dividends - preferred series Dividends, Preferred Stock, Cash Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Issuances of common stock and restricted stock, shares, net of forfeitures Stock Issued During Period, Shares, New Issues and Restricted Stock, Net of Forfeitures (in shares) Stock Issued During Period, Shares, New Issues and Restricted Stock, Net of Forfeitures Issuances of common stock and restricted stock, value, net of forfeitures Stock Issued During Period, Value, New Issues and Restricted Stock, Net of Forfeitures Stock Issued During Period, Value, New Issues and Restricted Stock, Net of Forfeitures Exercise of stock options and warrants, tax effects of exercises and restricted stock vesting, shares Stock Issued During Period, Shares, Stock Options and Warrants Exercised and Restricted Stock Vesting Stock Issued During Period, Shares, Stock Options and Warrants Exercised and Restricted Stock Vesting Exercise of stock options and warrants, tax effects of exercises and restricted stock vesting, value Stock Issued During Period, Value, Stock Options and Warrants Exercised and Restricted Stock Vesting Stock Issued During Period, Value, Stock Options and Warrants Exercised and Restricted Stock Vesting Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Compensation expense for restricted stock awards, restricted stock units and stock options Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Ending balance Ending balance (shares) Realized gains (losses): Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments [Abstract] Gross realized gains Available-for-sale Securities, Gross Realized Gains Gross realized losses Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments Net realized gains (losses) Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments OTTI recognized in earnings: Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract] Credit-related OTTI Other than Temporary Impairment, Credit Losses Recognized In Earnings, Additions Other than Temporary Impairment, Credit Losses Recognized In Earnings, Additions Intent to Sell OTTI Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities, Intent to Sell Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities, Intent to Sell Total OTTI recognized in earnings Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities Net securities gains (losses) Available-for-sale Securities, Gross Realized Gain (Loss) Proceeds from sales Proceeds from Sale of Available-for-sale Securities Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Defined Pension Benefits Pension Plan [Member] Other Postretirement Benefits Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of transition obligation, prior service credit, and net actuarial loss (gain) Defined Benefit Obligation, Amortization of (Gains) Losses, Transition Obligations (Assets), and Prior Service Cost (Credit) Defined Benefit Obligation, Amortization of (Gains) Losses, Transition Obligations (Assets), and Prior Service Cost (Credit) Net periodic benefit gain Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Home Loans Receivable Home Loans Receivable [Member] Home Loans Receivable [Member] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Loans excluding Acquired Loans Receivables Excluding Receivables Acquired With Deteriorated Credit Quality [Member] Receivables Excluding Receivables Acquired With Deteriorated Credit Quality [Member] Acquired Loans Origination Year Concentration Risk Origination Year Concentration Risk [Member] Origination Year Concentration Risk [Member] Lien Type Concentration Risk Lien Type Concentration Risk [Member] Lien Type Concentration Risk [Member] Interest Rate Type Concentration Risk Interest Rate Type Concentration Risk [Member] Interest Rate Type Concentration Risk [Member] Mortgage Loan, Origination Year [Axis] Mortgage Loan, Origination Year [Axis] Mortgage Loan, Origination Year [Axis] Mortgage Loan, Origination Year [Domain] Mortgage Loan, Origination Year [Domain] [Domain] for Mortgage Loan, Origination Year [Axis] Origination during or before 2008 OriginationDuringOrBefore2008 [Member] OriginationDuringOrBefore2008 [Member] 2009 Origination 2009 [Member] Origination 2009 2010 Origination 2010 [Member] Origination 2010 2011 Origination 2011 [Member] Year six. 2012 Origination 2012 [Member] Origination 2012 2013 Origination 2013 [Member] Origination 2013 2014 Origination 2014 [Member] Origination 2014 2015 Origination 2015 [Member] Origination 2015 [Member] 2016 Origination 2016 [Member] Origination 2016 [Member] 2017 Loan Origination Year 2017 [Member] Loan Origination Year 2017 [Member] Maryland MARYLAND Virginia VIRGINIA Louisiana LOUISIANA TEXAS ARIZONA ARIZONA Lien Category [Axis] Lien Category [Axis] Lien Category [Domain] Lien Category [Domain] 1st lien Senior Lien [Member] 2nd lien Junior Lien [Member] Mortgage Loans on Real Estate, Loan Type [Axis] Mortgage Loans on Real Estate, Loan Type [Axis] Mortgage Loans on Real Estate, Loan Type [Domain] Mortgage Loans on Real Estate, Loan Type [Domain] Fixed rate Fixed Rate Residential Mortgage [Member] Adjustable rate Adjustable Rate Residential Mortgage [Member] Total investments securities Marketable Securities Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Non-Interest Income Other Non-Interest Income [Member] Other Non-Interest Income [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Gains (losses) recognized in earnings on derivatives Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Gains (losses) recognized in earnings on hedged items Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Net fair value hedge ineffectiveness gains (losses) Gain (Loss) on Fair Value Hedge Ineffectiveness, Net Gains (losses) on derivatives not designated as accounting hedges Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Net derivative gains recognized in earnings Derivative, Gain (Loss) on Derivative, Net Georgia GEORGIA Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] GreenPoint Manufactured Housing Gpm Mfh [Member] Presentation of information regarding securitization programs containing manufactured housing loan receivables. Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Affordable housing entities Affordable Housing Entities [Member] The Company invests in affordable housing properties. Affordable housing VIEs can be corporations, partnerships, trusts, or any other legal structure used for investing in affordable housing properties. The Company consolidates those VIEs in which it has a variable interest, power to direct significant activities of the VIE, and obligation to absorb losses or right to receive benefits that could be significant to the VIE. The Company's exposure to losses is limited to its variable interests. Entities that provide capital to low-income and rural communities Investment Companies Providing Capital to Low-Income and Rural Communities [Member] Investment Companies Providing Capital to Low-Income and Rural Communities Other Other Investments [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Continuing Involvement with Derecognized Transferred Financial Assets, Liabilities Incurred Funded HELOCs advances Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Cumulative Amount Advanced Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Cumulative Amount Advanced Unfunded commitment on residual interests on trusts Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Unfunded Commitment On Residual Interests On Trusts Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Unfunded Commitment On Residual Interests On Trusts Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Letters of credit funded Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Letters of Credit Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Letters of Credit Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Amount Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Amount Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities Amortization Method Qualified Affordable Housing Project Investments, Amortization Amortization Method Qualified Affordable Housing Project Investments, Amortization Affordable Housing Tax Credits And Other Tax Benefits, Amount Affordable Housing Tax Credits and Other Tax Benefits, Amount Amortization Method Qualified Affordable Housing Project Investments Amortization Method Qualified Affordable Housing Project Investments Qualified Affordable Housing Project Investments, Commitment Qualified Affordable Housing Project Investments, Commitment Affordable Housing Tax Credits Commitment, Year to be Paid Affordable Housing Tax Credits Commitment, Year to be Paid Total assets of the unconsolidated VIE investment funds Variable Interest Entity, Nonconsolidated, Total Assets Variable Interest Entity, Nonconsolidated, Total Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Current income tax provision: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal taxes Current Federal Tax Expense (Benefit) State taxes Current State and Local Tax Expense (Benefit) International taxes Current Foreign Tax Expense (Benefit) Total current provision Current Income Tax Expense (Benefit) Deferred income tax (benefit) provision: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal taxes Deferred Federal Income Tax Expense (Benefit) State taxes Deferred State and Local Income Tax Expense (Benefit) International taxes Deferred Foreign Income Tax Expense (Benefit) Total deferred (benefit) provision Deferred Income Tax Expense (Benefit) Income tax provision (benefit) Net income available to common stockholders Total weighted-average basic shares outstanding Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Stock options Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Other contingently issuable shares Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Warrants Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Total effect of dilutive securities Weighted Average Number Diluted Shares Outstanding Adjustment Total weighted-average diluted shares outstanding Weighted Average Number of Shares Outstanding, Diluted Net income per basic common share (in dollars per share) Net income per diluted common share (in dollars per share) Earnings Per Common Share Earnings Per Share [Text Block] Commitments, Contingencies, Guarantees and Others Commitments Contingencies and Guarantees [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Amended and Restated 2004 Stock Incentive Plan Stock Incentive Plan 2004 [Member] The active stock-based employee compensation plan. Under the plan, we reserve common shares for issuance in various forms including incentive stock options, nonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock units, and performance share units. Performance Shares Awards Performance Shares [Member] Performance Share Units Performance Share Units [Member] Performance share units. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Shares/Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested as of beginning of the period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unvested as of end of period Weighted Average Grant Date Fair Value per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Unvested as of beginning of the period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Unvested as of end of the period Subsidiaries Subsidiaries [Member] Loss Contingency Accrual Change in benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Accumulated benefit obligation as of January 1, Defined Benefit Plan, Accumulated Benefit Obligation Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Net actuarial loss (gain) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Accumulated benefit obligation as of December 31, Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Fair value of plan assets as of January 1, Defined Benefit Plan, Fair Value of Plan Assets Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Fair value of plan assets as of December 31, Over (under) funded status as of December 31, Defined Benefit Plan, Funded (Unfunded) Status of Plan Number of Operating Segments Number of Operating Segments Number of Reporting Units Number of Reporting Units Banking and Thrift [Abstract] Schedule of Deposits and Borrowings Maturities [Table] Schedule of Deposits and Borrowings Maturities [Table] Schedule of Deposits and Borrowings Maturities [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] other borrowings [Member] other borrowings [Member] other borrowings Senior and Subordinated Notes Long-term and Short-term Debt Type [Axis] Long-term and Short-term Debt Type [Axis] Long-term and Short-term Debt Type [Axis] Long-term and Short-term Debt Type [Domain] Long-term and Short-term Debt Type [Domain] Long-term and Short-term Debt Type [Domain] Federal funds purchased and securities loaned or sold under agreements to repurchase FHLB advances Deposits and Borrowings Maturities [Line Items] Deposits and Borrowings Maturities [Line Items] Deposits and Borrowings Maturities [Line Items] Time Deposits, Fiscal Year Maturity: Time Deposits With Contractual Maturity Dates, Fiscal Year Maturity [Abstract] Time Deposits With Contractual Maturity Dates, Fiscal Year Maturity [Abstract] 2018 Time Deposit Maturities With Contractual Maturity Dates, Next Twelve Months Time Deposit Maturities With Contractual Maturity Dates, Next Twelve Months 2019 Time Deposit Maturities With Contractual Maturity Dates, Year Two Time Deposit Maturities With Contractual Maturity Dates, Year Two 2020 Time Deposit Maturities With Contractual Maturity Dates, Year Three Time Deposit Maturities With Contractual Maturity Dates, Year Three 2021 Time Deposit Maturities With Contractual Maturity Dates, Year Four Time Deposit Maturities With Contractual Maturity Dates, Year Four 2022 Time Deposit Maturities With Contractual Maturity Dates, Year Five Time Deposit Maturities With Contractual Maturity Dates, Year Five Thereafter Time Deposit Maturities With Contractual Maturity Dates, After Year Five Time Deposit Maturities With Contractual Maturity Dates, After Year Five Total Time Deposits With Contractual Maturity Dates Time Deposits With Contractual Maturity Dates Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Debt Fiscal Year Maturity: Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Long-term Debt Short-term debt, maturities, next 12 months Short-term debt, maturities, next 12 months Short-term debt, maturities, next 12 months Secured Debt Secured Debt Total Debt, Long-term and Short-term, Combined Amount Total, Fiscal Year Maturity: Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Fiscal Year Maturity [Abstract] 2018 Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Maturities, Next Twelve Months Time Deposits Maturities With Contractual Maturity Dates, Debt, Long-term and Short-term, Combined Amount, Maturities, Next Twelve Months 2019 Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Two Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Two 2020 Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Three Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Three 2021 Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Four Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Four 2022 Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Five Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, Year Five Thereafter Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, After Year Five Time Deposits Maturities With Contractual Maturity Dates and Long-Term Debt Maturities, After Year Five Total Time Deposits Maturities With Contractual Maturity Dates and Debt Long term and Short term Combined Amount Time Deposits Maturities With Contractual Maturity Dates and Debt Long term and Short term Combined Amount Notional and Fair Values of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Offsetting Assets Offsetting Assets [Table Text Block] Offsetting Liabilities Offsetting Liabilities [Table Text Block] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Fair Value Hedging and Free-Standing Derivatives Fair Value Hedging and Free-Standing Derivatives [Member] Fair Value Hedging and Free-Standing Derivatives [Member] Cash Flow Hedging and Net Investment Hedging Cash Flow Hedging and Net Investment Hedging [Member] Cash Flow Hedging and Net Investment Hedging [Member] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Stock-Based Compensation Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Regulated Operations [Abstract] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Capital One Bank (USA), N.A. Capital One Bank (USA) N.A. [Member] Capital One Bank (USA) N.A. [Member] Capital One, N.A. Capital One, N.A. [Member] Capital One, N.A. [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Forecast Scenario, Forecast [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Basel III Transition Provisions, Inclusion of AOCI and Intangible Asset Adjustments Basel III Transition Provisions, Inclusion of AOCI and Intangible Asset Adjustments Basel III Transition Provisions, Inclusion of AOCI and Intangible Asset Adjustments Statutory Accounting Practices, Statutory Amount Available for Dividend Payments Statutory Accounting Practices, Statutory Amount Available for Dividend Payments Regulatory and Capital Adequacy Regulatory Capital Requirements under Banking Regulations [Text Block] Statement of Financial Position [Abstract] Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock, common, shares Treasury Stock, Common, Shares Securities available for sale Available-for-sale Securities, Expected Debt Maturities, Fair Value, Rolling Maturity [Abstract] Available-for-sale Securities, Expected Debt Maturities, Fair Value, Rolling Maturity [Abstract] Due in 1 year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Due after 1 year through 5 years Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value Due after 5 years through 10 years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Due 10 Years Available-for-sale Securities, Expected Debt Maturities, Rolling after Year Ten, Fair Value Available-for-sale Securities, Expected Debt Maturities, Rolling after Year Ten, Fair Value Available-for-sale Securities Amortized cost of securities available for sale Available-for-sale Securities, Expected Debt Maturities, Amortized Cost Basis, Rolling Maturity Available-for-sale Securities, Expected Debt Maturities, Amortized Cost Basis, Rolling Maturity Due in 1 year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis Due after 5 years through 10 years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis Due 10 Years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis Weighted average yield for securities available for sale Available-for-sale Securities, Weighted Average Yield [Abstract] Available-for-sale Securities, Weighted Average Yield [Abstract] Due in 1 Year or Less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Weighted Average Yield Available-for-sale Securities,Debt Maturities, Next Rolling Twelve Months, Weighted Average Yield Due 1 Year through 5 Years Available-for-sale Securities,Debt Maturities, Rolling Year Two Through Five, Weighted Average Yield Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Weighted Average Yield Due 5 Years through 10 Years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Weighted Average Yield Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Weighted Average Yield Due 10 Years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Weighted Average Yield Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Weighted Average Yield Total weighted average yield Available-for-sale Securities, Weighted Average Yield Available-for-sale Securities, Weighted Average Yield Carrying value of securities held to maturity Held-to-maturity Securities, Expected Debt Maturities, Net Carrying Amount [Abstract] Held-to-maturity Securities, Expected Debt Maturities, Net Carrying Amount [Abstract] Due in 1 year or less Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Due 1 year through 5 years Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Due after 5 years through 10 years Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Due after 10 years Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost Carrying Value Fair value of securities held to maturity Held-to-maturity Securities, Expected Debt Maturities, Fair Value, Rolling Maturity [Abstract] Held-to-maturity Securities, Expected Debt Maturities, Fair Value, Rolling Maturity [Abstract] Due in 1 Year or Less Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Due 1 Year through 5 Years Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value Due 5 Years through 10 Years Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Due 10 Years Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Fair Value Fair Value Weighted average yield for securities held to maturity Held-to-maturity Securities, Expected Debt Maturities, Weighted Average Yield [Abstract] Held-to-maturity Securities, Expected Debt Maturities, Weighted Average Yield [Abstract] Due in 1 Year or Less Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Weighted-Average Yield Held-to-maturity Securities, Expected Debt Maturities, Next Rolling Twelve Months, Weighted-Average Yield Due 1 Year through 5 Years Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Weighted-Average Yield Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Weighted-Average Yield Due 5 Years through 10 Years Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Weighted-Average Yield Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Weighted-Average Yield Due 10 Years Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Weighted-Average Yield Held-to-maturity Securities,Debt Maturities, Rolling after Ten Years, Weighted-Average Yield Total weighted average yield Held To Maturity Securities, Debt Maturities, Weighted Average Yield Held to maturity securities debt maturities weighted average yield Weighted-average expected life Held-to-maturity Securities, Debt Maturities, Weighted-average Expected Life weighted average expected life Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Other Unallocated Financing Receivables [Member] Total Allowance Allowance for Loan and Lease Losses [Member] Unfunded Lending Commitments Reserve Unfunded Loan Commitment [Member] Combined Allowance & Unfunded Reserve Combined Allowance And Unfunded Reserve [Member] Combined allowance and unfunded reserve. Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Balance as beginning of the period Loans and Leases Receivable, Allowance Charge-offs Allowance for Loan and Lease Losses, Write-offs Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Net charge-offs Allowance for Loan and Lease Losses Write-offs, Net Provision (benefit) for loan and lease losses Provision for Loan and Lease Losses Allowance build (release) for loan and lease losses Allowance for Loan and Lease Losses, Period Increase (Decrease) Other changes Allowance for Loan and Lease Losses, Adjustments, Other Balance at end of the period Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Interest income Non-interest income Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Interest from temporary investments Interest expense Dividends from Subsidiaries Dividends from Subsidiaries Dividends from Subsidiaries Non-interest expense Income before income taxes and equity in undistributed earnings of subsidiaries Income (Loss) from Continuing Operations before Equity in Undistributed Earnings of Subsidiaries Income (Loss) from Continuing Operations before Equity in Undistributed Earnings of Subsidiaries Income tax (benefit) Income (loss) from subsidiary including discontinued operations, net of tax Income (loss) from subsidiary including discontinued operations, net of tax Income (loss) from subsidiary including discontinued operations, net of tax Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Common collective trusts Common Collective Trusts [Member] Common collective trusts. Corporate bonds (S&P rating of A or higher) Corporate Bonds, Standard & Poor's, A Rating or Higher [Member] Corporate Bonds, Standard & Poor's, A Rating or Higher [Member] Corporate bonds (S&P rating of lower than A) Corporate Bonds, Standard & Poor's, Lower Than A Rating [Member] Corporate Bonds, Standard & Poor's, Lower Than A Rating [Member] US Treasury and Government US Treasury and Government [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Municipal bonds Municipal Bonds [Member] Money market fund Money Market Funds [Member] Fixed Income Securities [Member] Fixed Income Securities [Member] Plan asset allocation percentage Defined Benefit Plan, Actual Plan Asset Allocations Income Tax Effects Allocated Directly to Equity [Abstract] Income Tax Effects Allocated Directly to Equity [Abstract] Income tax provision (benefit) recorded in additional paid in capital Income Tax Effects Allocated Directly to Equity, Other Foreign currency translation gains Income Tax Effects Allocated Directly to Equity, Foreign Currency Translation Gain (Loss) Income Tax Effects Allocated Directly to Equity, Foreign Currency Translation Gain (Loss) Total income tax provision (benefit) recorded in stockholders’ equity Income Tax Effects Allocated Directly to Equity Government securities Municipal bonds Total plan assets, at fair value Total plan assets [Member] Total plan assets [Member] Assets in fair value hierarchy Derivative assets(1)(2) Offsetting Derivative Assets [Abstract] Derivative Asset, Offsetting Financial Instruments Derivative Asset, Fair Value, Gross Liability Derivative Assets, Offsetting Cash Collateral Derivative Asset, Collateral, Obligation to Return Cash, Offset Derivative Asset, Securities Not Netted Derivative Asset, Fair Value of Collateral Net Exposure Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative Asset, Not Subject to Master Netting Arrangement Derivative Asset, Not Subject to Master Netting Arrangement Schedule of Comparison of Capital Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] GreenPoint Subsidiary GreenPoint Subsidiary [Member] GreenPoint Subsidiary [Member] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Pending Litigation Pending Litigation [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Interchange Litigation Interchange Litigation [Member] Interchange Litigation [Member] U.S. Bank Litigation Us Bank Litigation [Member] GreenPoint is a defendant in a lawsuit wherein plaintiffs allege GreenPoint is obligated to repurchase an entire portfolio of mortgage loans based on alleged breaches of representations and warranties. FHFA Litigation FHFA Litigation [Member] FHFA Litigation [Member] Litigation Settlement, Attributable to Reporting Entity and Third Party, Percent of Transactions Litigation Settlement, Attributable to Reporting Entity and Third Party, Percent of Transactions Litigation Settlement, Attributable to Reporting Entity and Third Party, Percent of Transactions Loss contingency, estimate of possible loss Loss Contingency, Estimate of Possible Loss Litigation settlement, attributable to reporting entity and third party Litigation Settlement, Amount Attributable to Reporting Entity and Third Party Litigation Settlement, Amount Attributable to Reporting Entity and Third Party Litigation settlement, attributable to reporting entity and third party, period of payment of settlement Litigation Settlement, Attributable to Reporting Entity and Third Party, Period of Payment of Settlement Litigation Settlement, Attributable to Reporting Entity and Third Party, Period of Payment of Settlement Number of contracts breached Litigation, Number of Contracts Breached Litigation, Number of Contracts Breached Number of mortgage loans sold to third party under litigation Litigation, Number of Mortgage Loans Sold to Third Party Under Litigation Litigation, Number of Mortgage Loans Sold to Third Party Under Litigation Mortgage loans sold to third party, face amount under litigation Mortgage Loans on Real Estate, Sold to Third Party, Face Amount Under Litigation Mortgage Loans on Real Estate, Sold to Third Party, Face Amount Under Litigation Number of summons filed Litigation, Number of Summons Filed Litigation, Number of Summons Filed Number of residential mortgage backed securities trusts Litigation, Number of Residential Mortgage Backed Securities Trusts Litigation, Number of Residential Mortgage Backed Securities Trusts Loss Contingency Accrual, Payments Loss Contingency Accrual, Payments Residential Mortgage Backed Securities [Member] Non-agency RMBS and CMBS, Non-agency ABS and Other Securities Non-agency RMBS and CMBS, Non-agency ABS and Other Securities [Member] Non-agency RMBS and CMBS, Non-agency ABS and Other Securities [Member] Investment Securities Portfolio Investment Securities Portfolio [Member] Investment Securities Portfolio [Member] Gross Unrealized Losses on Available-for-sale Securities Gross Unrealized Losses on Available-for-sale Securities [Member] Gross Unrealized Losses on Available-for-sale Securities [Member] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities Number of sale securities exceeding amortized cost over fair value Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Difference in amortized cost and fair value of securities that had been in a loss position for 12 months or longer Securities held to maturity Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Fair value of securities pledged Available-for-sale Securities Pledged as Collateral Carrying value of securities pledged Held-to-maturity Securities Pledged as Collateral Fair value of securities pledged, accepted Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Income tax at U.S. federal statutory tax rate Effective income tax rate reconciliation, Impact of the Tax Act Effective income tax rate reconciliation, Impact of the Tax Act Effective income tax rate reconciliation, Impact of the Tax Act State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Low-income housing, new markets tax credits, and other credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Other foreign tax differences, net Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective tax rate Effective Income Tax Rate Reconciliation, Percent Derivative net liability position (less than $1 million) Derivative, Net Liability Position, Aggregate Fair Value Cumulative credit risk valuation adjustment related to our credit quality (less than $1 million) Loss (net after-tax) recorded in AOCI related to derivatives designated as cash flow hedges expected to be reclassified to earnings over the next 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Maximum length of time over which forecasted transactions were hedged, years Maximum Length of Time Hedged in Cash Flow Hedge Number of Contracts Financing Receivable, Modifications, Subsequent Default, Number of Contracts Total Loans Financing Receivable, Modifications, Subsequent Default, Recorded Investment Land Land [Member] Computer software In progress Construction in Progress [Member] Total premises and equipment, gross Property, Plant and Equipment, Gross Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total premises and equipment, net Property, Plant and Equipment, Net Credit card loan securitizations Credit Card Receivable [Member] Home loan Total securitization-related VIEs Securitization-Related Variable Interest Entities [Member] Securitization-Related Variable Interest Entities Total Other VIEs Nonsecuritization-Related Variable Interest Entities [Member] Nonsecuritization-Related Variable Interest Entities Carrying Amount of Assets, Consolidated Carrying Amount of Liabilities, Consolidated Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Carrying Amount of Assets, Unconsolidated Variable Interest Entities, nonconsolidated, Carrying amount of Assets included in certain investment structures Variable Interest Entities, nonconsolidated, Carrying amount of Assets included in certain investment structures In certain investment structures, we consolidate a VIE which in turn holds as its primary asset an investment in an unconsolidated VIE. This concept represents the carrying amount of assets related to these investment structures. Variable Interest Entities, nonconsolidated, Carrying amount of liabilities included in certain investment structures Variable Interest Entities, nonconsolidated, Carrying amount of liabilities included in certain investment structures In certain investment structures, we consolidate a VIE which in turn holds as its primary asset an investment in an unconsolidated VIE. This concept represents the carrying amount of liabilities related to these investment structures. Maximum exposure to loss Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Cabela [Member] Cabela [Member] Cabela Member Business Acquisition [Line Items] Business Acquisition [Line Items] Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Credit Card Receivables Business Combination, Recognized identifiable assets acquired and liabilities assumed, credit card receivable Business Combination, Recognized identifiable assets acquired and liabilities assumed, credit card receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business combination, recognized identifiable assets acquired and liabilities assumed, securitized debt obligation Business combination, recognized identifiable assets acquired and liabilities assumed, securitized debt obligation Business combination, recognized identifiable assets acquired and liabilities assumed, securitized debt obligation Schedule of Segment Results and Reconciliation Schedule of Segment Reporting Information, by Segment [Table Text Block] Customer Net Revenue Range CustomerNetRevenueRange Range of annual net revenue for our commercial and industrial customers. Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Type of Arrangement and Non-arrangement Transactions [Axis] Type of Arrangement and Non-arrangement Transactions [Axis] Arrangements and Non-arrangement Transactions [Domain] Arrangements and Non-arrangement Transactions [Domain] Loss Sharing Agreement [Member] Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Financing Receivable, Allowance for Credit Losses [Roll Forward] Financing Receivable, Allowance for Credit Losses [Roll Forward] Expected reimbursement from loss sharing partners Loss Sharing Agreements, Loans and Leases Receivable, Allowance, Covered, Expected Reimbursement Loss Sharing Agreements, Loans and Leases Receivable, Allowance, Covered, Expected Reimbursement Amounts charged to partners and impacting net charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Impact to provision for credit losses Collaborative Arrangement [Member] Collaborative Arrangement [Member] Customer Reward Program Customer Loyalty Program Liability Carrying amount as of the balance sheet date of liability related to rewards benefits earned by card holders. Loan Commitment and Origination Fees and Discounts or Premiums, Amortization Period Loan Commitment and Origination Fees and Discounts or Premiums, Amortization Period Loan Commitment and Origination Fees and Discounts or Premiums, Amortization Period Partnership Agreement Initial Term Partnership Agreement Initial Term Partnership agreement initial term. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Associate Stock Purchase Plan Associate Stock Purchase Plan [Member] A stock purchase plan under which our associates are eligible to purchase common stock through monthly salary deductions of a maximum of 15% and a minimum of 1% of monthly base pay. Dividend Reinvestment Stock Purchase Plan Dividend Reinvestment Stock Purchase Plan [Member] A dividend reinvestment and stock purchase plan which allows participating stockholders to purchase additional shares of our common stock through automatic reinvestment of dividends or optional cash investments. Employee Stock Option Employee Stock Option [Member] Restricted Stock Restricted Stock [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Cash-Settled Units Cash-Settled Units [Member] Cash-Settled Units [Member] Number of active stock plans Number of Active Stock Plans Number of Active Stock Plans Shares authorized under plans (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares available for grant under plans (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Compensation expense from award Allocated Share-based Compensation Expense Recognized tax benefit from stock-based compensation arrangements Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Maximum contractual term (Years) Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Award vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Weighted-average fair value of options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Unrecognized compensation expense related to unvested awards, options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Weighted-average period of recognition of unrecognized compensation costs (Years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Total fair value of awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Unrecognized compensation expense related to unvested awards, awards other than options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Potential annual reduction in vesting based on performance (percent) Share-based Compensation Arrangement by Share-based Payment Award, Potential Annual Reduction in Vesting Based on Performance, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Potential Annual Reduction in Vesting Based on Performance, Percentage Performance vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Performance Period Share-based Compensation Arrangement by Share-based Payment Award, Performance Period Percentage of target award opportunities Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number of Common Shares Granted Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number of Common Shares Granted Number of common stock trading days required under vesting condition Share-based Compensation Arrangement by Share-based Payment Award, Number of Common Stock Trading Days Preceding the Vesting Date Share-based Compensation Arrangement by Share-based Payment Award, Number of Common Stock Trading Days Preceding the Vesting Date Cash payments to settle awards Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards Share Based Compensation Arrangement By Share Based Payment Award, Minimum Employee Subscription Rate Share Based Compensation Arrangement By Share Based Payment Award, Minimum Employee Subscription Rate An entity may opt to disclose the lowest percentage of annual salary that an employee is permitted to utilize with respect to the plan. Maximum percentage of monthly base pay eligible for the purchase plan Percentage of company's match on Associate Stock Purchase Plan contributions by employees (percent) Percentage of Company's match on Associate Stock Purchase Plan contributions Percentage of Company's match on Associate Stock Purchase Plan contributions Cash received for options exercised Proceeds from Stock Options Exercised Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options Allowance for Loans and Lease Losses Allowance for Credit Losses [Text Block] Shares Subject to Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding as of beginning of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding as of end of the period Exercisable as of end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted- Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding as of beginning of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Expired Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Outstanding as of end of the period Exercisable as of end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted-Average Remaining Contractual Term, Outstanding at end of period, years Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted-Average Remaining contractual Term Exercisable, at end of period years Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value, Outstanding, at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value, Exercisable, at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Amortized Cost Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment Unrealized Losses Recorded in AOCI Unrealized Losses Recorded In AOCI On Held To Maturity Securities Unrealized losses recorded in AOCI on held to maturity securities. Gross Unrealized Gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross Unrealized Losses Fair Value Domestic Equity Domestic Equity Securities [Member] Domestic Equity Securities [Member] International Equity Foreign Equity Securities [Member] Foreign Equity Securities [Member] Fixed Income Securities Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Contributions are expected to be made Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Accretable yield, beginning balance Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Addition due to acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions Accretion recognized in earnings Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Reclassifications from/(to) nonaccretable differences Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications (to) from Nonaccretable Difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications (to) from Nonaccretable Difference Changes in accretable yield for non-credit related changes in expected cash flows Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Increase (Decrease) Due to Non-Credit Related Changes in Expected Cash Flows Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Increase (Decrease) Due to Non-Credit Related Changes in Expected Cash Flows Accretable yield, ending balance Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Option Warrant Warrant [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Class of Warrant or Right, Outstanding Class of Warrant or Right, Outstanding Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Assets: Assets, Fair Value Disclosure [Abstract] Loans held for investment Gain (Loss) On Fair Value Loans Held For Investment Recognized In Earnings Gain (Loss) On Fair Value Loans Held For Investment Recognized In Earnings Loans held for sale Gain (Loss) On Fair Value Loans Held For Sale Recognized In Earnings Gain (Loss) On Fair Value Loans Held For Sale Recognized In Earnings Other assets Gain (Loss) On Fair Value Other Assets Recognized In Earnings Gain (Loss) On Fair Value Other Assets Recognized In Earnings Total Gain (Loss) On Fair Value Assets Recognized In Earnings Gain (Loss) On Fair Value Assets Recognized In Earnings Small Business Banking Loans Small Business Banking Loans [Member] Small Business Banking Loans [Member] Other Consumer Loans Other Consumer Loans [Member] Other Consumer Loans [Member] Auto and home loan [Member] Auto and home loan [Member] Auto and home loan [Member] Privileges Revoked Privileges Revoked [Member] Privileges Revoked [Member] Notification of Death Notification of Death [Member] Notification of Death [Member] Chapter Seven Bankruptcy Chapter Seven Bankruptcy [Member] Chapter Seven Bankruptcy [Member] Loan origination fees and direct loan origination costs amortization period Maximum term for loan modification under fixed payment plans Maximum Term For Loan Modification Under Fixed Payment Plans Maximum term for loan modification under fixed payment plans. Threshold period past due for delinquency status of financing receivables Threshold Period Past Due for Delinquency Status of Financing Receivables Threshold Period Past Due for Delinquency Status of Financing Receivables Threshold period past due for nonperforming status of financing receivables Threshold Period Past Due for Nonperforming Status of Financing Receivables Threshold Period Past Due for Nonperforming Status of Financing Receivables Threshold period past due for write-off of financing receivable Threshold Period Past Due for Write-off of Financing Receivable Threshold Period Following Bankruptcy Notice for Write-off of Financing Receivable Threshold Period Following Bankruptcy Notice for Write-off of Financing Receivable Threshold Period Following Bankruptcy Notice for Write-off of Financing Receivable Threshold period of consecutive payments to remove from nonaccrual status Threshold Period of Consecutive Payments to Remove from Nonaccrual Status Threshold Period of Consecutive Payments to Remove from Nonaccrual Status Number of components used to develop allowance for loan and lease losses Number of Components Used to Develop Allowance for Loan and Lease Losses Number of Components Used to Develop Allowance for Loan and Lease Losses Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Dividend yield (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Volatility (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected option lives (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Fair Value Measurement Fair Value Disclosures [Text Block] Summary of Results from Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] Financing Receivables, 30 to 59 Days Past Due [Member] Financing Receivables, 30 to 59 Days Past Due [Member] Financing Receivables, 60 to 89 Days Past Due [Member] Financing Receivables, 60 to 89 Days Past Due [Member] Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Aging [Abstract] Financing Receivable, Recorded Investment, Aging [Abstract] Current Financing Receivable, Recorded Investment, Current Past due Financing Receivable, Recorded Investment, Past Due Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract] Financing Receivable, Percent Current Financing Receivable, Percent Current Financing Receivable, Percent Current Total Delinquent Loans (as percent) Financing Receivable, Percent Past Due Total Loans (as percent) Financing Receivable, Percentage of Total Loan Financing Receivable Percentage Of Total Loan Loans and Leases Receivable, Deferred Income Loans and Leases Receivable, Deferred Income Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plan, Expected Future Benefit Payment [Abstract] Defined Benefit Plan, Expected Future Benefit Payment [Abstract] 2018 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2019 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2023-2027 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Premises, Equipment & Lease Commitments Property Plant Equipment and Operating Lease Commitments Disclosure [Text Block] Disclosure of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. This includes assets that are purchased or leased. Examples include land, building and production equipment. This disclosure may include a schedule of property, plant and equipment gross, depreciation, and net, accumulated depreciation, depletion, useful lives, and income statement disclosures. 90 Days Past Due and Accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Nonperforming Loans Financing Receivable, Recorded Investment, Nonaccrual Status Percent 90 days past due and still accruing Financing Receivable, Percent 90 Days Past Due and Still Accruing Financing Receivable, Percent 90 Days Past Due and Still Accruing Financing Receivable, Nonaccrual, Percent Past Due Financing Receivable, Nonaccrual, Percent Past Due Income Taxes Income Tax Disclosure [Text Block] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Uncollectible Receivables Uncollectible Receivables [Member] Net charge-offs Percentage annualized net charge-off by average loans held for investment Percentage Annualized Net Charge-Offs by Average Loans Held for Investment Percentage Annualized Net Charge-Offs by Average Loans Held for Investment Percentage Annualized Net Charge-Offs by Average Loans Held for Investment, Excluding Loans Acquired Impact Percentage Annualized Net Charge-Offs by Average Loans Held for Investment, Excluding Loans Acquired Impact Percentage Annualized Net Charge-Offs by Average Loans Held for Investment, Excluding Loans Acquired Impact Nonperforming loans, excluding acquired loans (as percent) Loan Receivable, Nonaccrual, Percent Past Due, Excluding Acquired Loans Loan Receivable, Nonaccrual, Percent Past Due, Excluding Acquired Loans Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Loans held in consolidated trusts Unsecuritized loans held for investment Assets: Assets [Abstract] Cash and cash equivalents: Cash and Cash Equivalents [Abstract] Cash and due from banks Cash and Due from Banks Interest-bearing deposits and other short-term investments Interest-bearing Deposits in Banks and Other Financial Institutions Total cash and cash equivalents Restricted cash for securitization investors Restricted Cash and Cash Equivalents Loans held for investment: Loans and Leases Receivable, Net Amount [Abstract] Total loans held for investment Allowance for loan and lease losses Net loans held for investment Loans and Leases Receivable, Net Amount Loans held for sale, at lower of cost or fair value Premises and equipment, net Interest receivable Interest Receivable Goodwill Other assets Other Assets Total assets Assets Liabilities: Liabilities [Abstract] Interest payable Interest Payable Deposits: Deposits [Abstract] Non-interest-bearing deposits Noninterest-bearing Deposit Liabilities Interest-bearing deposits Interest-bearing Deposit Liabilities Total deposits Securitized debt obligations Other debt: Other Debt [Abstract] Other debt. Federal funds purchased and securities loaned or sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Senior and subordinated notes Unsecured Debt Other borrowings Other Borrowings Total other debt Debt, Excluding Secured Debt Debt, Excluding Secured Debt Other liabilities Other Liabilities Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock (par value $.01 per share; 50,000,000 shares authorized; 4,475,000 shares issued and outstanding as of both December 31, 2017 and 2016) Preferred Stock, Value, Issued Common stock (par value $.01 per share; 1,000,000,000 shares authorized; 661,724,927 and 653,736,607 shares issued as of December 31, 2017 and 2016, respectively, 485,525,340 and 480,218,547 shares outstanding as of December 31, 2017 and 2016, respectively) Common Stock, Value, Issued Additional paid-in capital, net Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Treasury stock, at cost (par value $.01 per share; 176,199,587 and 173,518,060 shares as of December 31, 2017 and 2016, respectively) Treasury Stock, Common, Value Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Deferred tax assets: Deferred Tax Assets, Net of Valuation Allowance [Abstract] Allowance for loan and lease losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Rewards programs Deferred Tax Assets, Rewards Programs Deferred tax assets rewards programs Security and loan valuations Deferred Tax Assets, Security and Loan Valuations Deferred tax assets security and loan valuations. Net operating loss and tax credit carryforwards Deferred Tax Assets, Operating Loss Carryforwards and Tax Credit Carryforward Amount before allocation of valuation allowances of deferred tax asset attributable to operating loss and tax credit carryforwards. Compensation and employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Goodwill and intangibles Deferred Tax Assets, Goodwill and Intangible Assets Unearned income Deferred Tax Assets, Deferred Income Net unrealized losses on derivatives Deferred Tax Assets, Derivative Instruments Representation and warranty reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Other assets Deferred Tax Assets, Other Subtotal Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Original issue discount Deferred Tax Liabilities, Original Issue Discount The amount as of the balance sheet date of the estimated future tax effects attributable to interchange, late fees, cash advance fees and over limit fees. These items are generally treated as original issue discount ("OID") for tax purposes and recognized over the life of the related credit card receivables. Fixed assets and leases Deferred Tax Liabilities, Property, Plant and Equipment Deferred tax liabilities, loan fees and expenses Deferred tax liabilities, loan fees and expenses Deferred tax liabilities, loan fees and expenses Deferred Tax Liabilities, Mortgage Servicing Rights Deferred Tax Liabilities, Mortgage Servicing Rights Other liabilities Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax assets Deferred Tax Assets, Net Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Impaired Financing Receivable: Impaired Financing Receivable, Recorded Investment [Abstract] With an Allowance Impaired Financing Receivable, with Related Allowance, Recorded Investment Without an Allowance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Total Recorded Investment Impaired Financing Receivable, Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Net Recorded Investment Impaired Financing Receivable, Recorded Investment, Net of Related Allowance Impaired Financing Receivable, Recorded Investment, Net of Related Allowance Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Income Tax Contingency [Table] Income Tax Contingency [Table] Nature of Uncertainty [Axis] Nature of Uncertainty [Axis] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] Gross Unrecognized Tax Benefits Gross Unrecognized Tax Benefits [Member] The balance of unrecognized tax benefits and changes in the period. Accrued Interest and Penalties Accrued Interest And Penalties [Member] The balance of unrecognized tax benefits and changes in the period. Gross Tax, Interest and Penalties Gross Tax Interest And Penalties [Member] The total of the unrecognized tax benefit and changes in the period and accrued interest and penalties related to the benefit. Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Beginning balance Unrecognized Tax Benefits Additions for tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Reductions for tax positions related to prior years due to IRS and other settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Ending balance Portion of balance at December 31, that, if recognized, would impact the effective income tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Statement of Cash Flows [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization, net Depreciation, Depletion and Amortization, Nonproduction Deferred tax benefit Net (gains) losses on sales of securities available for sale Impairment losses on securities available for sale Gain on sales of loans held for sale Gain (Loss) on Sales of Loans, Net Stock-based compensation expense Share-based Compensation Other Other Noncash Income Loans held for sale: Increase (Decrease) in Loans Held-for-sale [Abstract] Originations and purchases Payments for Origination and Purchases of Loans Held-for-sale Proceeds from sales and paydowns Proceeds from Sale and Collection of Loans Held-for-sale Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Changes in interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Changes in other assets Increase (Decrease) in Other Operating Assets Changes in interest payable Increase (Decrease) in Interest Payable, Net Changes in other liabilities Increase (Decrease) in Other Operating Liabilities Net change from discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Investing activities: Securities available for sale: Proceeds from Sale and Maturity of Available-for-sale Securities [Abstract] Purchases Proceeds from paydowns and maturities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from sales Securities held to maturity: Proceeds from Sale and Maturity of Held-to-maturity Securities [Abstract] Purchases Payments to Acquire Held-to-maturity Securities Proceeds from paydowns and maturities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Loans: Payments for (Proceeds from) Loans and Leases [Abstract] Net changes in loans held for investment Payments for (Proceeds from) Loans and Leases Principal recoveries of loans previously charged off Proceeds from Recoveries of Loans Previously Charged off Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Payments to Acquire Businesses, Net of Cash Acquired Net cash from other investing activities Payments for (Proceeds from) Other Investing Activities Changes in deposits Increase (Decrease) in Deposits Proceeds from Issuance of Secured Debt Proceeds from Issuance of Secured Debt Maturities and paydowns of securitized debt obligations Repayments of Secured Debt Issuance of senior and subordinated notes and long-term FHLB advances Proceeds from Issuance of Unsecured Debt and Long Term FHLB Advances, Net of Issuance Cost Proceeds from issuance of senior and sub notes and long term FHLB advances, Net of Issuance Cost Maturities and paydowns of senior and subordinated notes and long-term FHLB advances Repayments of Unsecured Debt and Long Term FHLB Advances The cash outflow to repay senior and subordinated notes and long term FHLB Advances. Changes in other borrowings Proceeds from (Repayments of) Other Debt Common stock: Dividends paid Preferred stock: Proceeds from Issuance of Preferred Stock Dividends paid Purchases of treasury stock Proceeds from share-based payment activities Changes in cash, cash equivalents and restricted cash for securitization investors Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash for securitization investors, beginning of the period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash for securitization investors, ending of the period Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Non-cash items: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Net transfers from loans held for investment to loans held for sale Transfer of Portfolio Loans and Leases to Held-for-sale Securitized debt obligations assumed in acquisition Noncash or Part Noncash Acquisition, Debt Assumed Loans held for sale acquired by assuming other borrowings Loans held for sale acquired by assuming other borrowings Non-cash item, loans held for sale acquired by assuming other borrowings Interest paid Interest Paid Income tax paid Income Taxes Paid Allowance for loan and lease losses by impairment methodology: Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Collectively evaluated Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Asset-specific Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Total allowance for loan and lease losses Loans held for investment by impairment methodology: Held For Investment Loans By Impairment Methodology [Abstract] Held for investment loans by impairment methodology. Collectively evaluated Financing Receivable, Collectively Evaluated for Impairment Asset-specific Financing Receivable, Individually Evaluated for Impairment Allowance as a percentage of period-end loans held for investment Financing Receivable, Allowance for Credit Losses, Percentage of Held for Investment Loans Financing Receivable, Allowance for Credit Losses, Percentage of Held for Investment Loans Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] Prior service cost Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Net actuarial gain (loss) Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Accumulated other comprehensive (loss) income Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Variable Interest Entities and Securitizations Variable Interest Entity Disclosure [Text Block] Interest Income (Expense) Interest Income (Expense) [Member] Interest Income (Expense) [Member] Gains (losses) recorded in AOCI Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Gains (losses) reclassified from AOCI into earnings Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Gains (losses) recognized in earnings due to ineffectiveness Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Net derivative gains recognized in earnings Before Tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Net unrealized gains (losses) on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent Net changes in securities held to maturity Other Comprehensive Income (Loss) Securities Transferred To Held To Maturity Adjustment Before Tax Portion Attributable To Parent Other Comprehensive Income (Loss) Securities Transferred To Held To Maturity Adjustment Before Tax Portion Attributable To Parent Net unrealized gains (losses) on cash flow hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Other Other Comprehensive Income (Loss), Before Tax, Attributable To Parent Other Comprehensive Income (Loss), Other, Before Tax, Attributable To Parent Other comprehensive income before taxes Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Provision (Benefit) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] Net unrealized gains (losses) on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent Net changes in securities held to maturity Other Comprehensive Income (Loss) Securities Transferred To Held To Maturity Adjustment, Tax, Portion Attributable To Parent Other Comprehensive Income (Loss) Securities Transferred To Held To Maturity Adjustment, Tax, Portion Attributable To Parent Net unrealized gains (losses) on cash flow hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent Other Other Comprehensive Income (Loss), Other Tax, Attributable To Parent Other Comprehensive Income (Loss), Other Tax, Attributable To Parent Other comprehensive income (loss), provision (benefit) Net unrealized gains (losses) on securities available for sale Net changes in securities held to maturity Net unrealized gains (losses) on cash flow hedges Foreign currency translation adjustments Other Reduction in Interest Income Condensed Income Statement Condensed Income Statement [Table Text Block] Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Components of Goodwill, Intangible Assets and MSRs Schedule of Intangible Assets and Goodwill [Table Text Block] Goodwill Attributable to Business Segments Schedule of Goodwill [Table Text Block] Schedule of Finite-Lived Intangible Assets Amortization Expenses and Future Amortization Expense schedule of finite lived intangible assets Amortization Expenses and Future Amortization Expense [Table Text Block] schedule of finite lived intangible assets amortization expense and future amortization expense Common equity Tier 1 capital: Tier One Common Equity [Abstract] Tier One Common Equity [Abstract] Common equity Tier 1 Capital Common Equity Tier One Capital Common equity Tier 1 capital, capital ratio Common Equity Tier One Capital to Risk-Weighted Assets Common equity Tier 1 capital ratio is a regulatory capital measure under Basel III calculated based on common equity Tier 1 capital divided by risk-weighted assets. Common equity Tier 1 capital, minimum capital adequacy Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Common equity Tie 1 capital, well capitalized TierOneCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets Tier One Common Capital Required To Be Well Capitalized To Risk Weighted Assets Tier 1 risk-based capital: Risk Based Ratios [Abstract] Tier 1 capital Tier One Risk Based Capital Tier 1 capital, capital ratio Tier One Risk Based Capital to Risk Weighted Assets Tier 1 capital, minimum capital adequacy Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 capital, well-capitalized Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Total risk-based capital: Capital [Abstract] Total capital Capital Total capital, capital ratio Capital to Risk Weighted Assets Total capital, minimum capital adequacy Capital Required for Capital Adequacy to Risk Weighted Assets Total capital, well-capitalized Capital Required to be Well Capitalized to Risk Weighted Assets Tier 1 leverage capital: Tier One Leverage Capital [Abstract] Tier 1 leverage capital Tier One Leverage Capital Tier 1 leverage, capital ratio Tier One Leverage Capital to Average Assets Tier 1 leverage, minimum capital adequacy Tier One Leverage Capital Required for Capital Adequacy to Average Assets Tier 1 leverage, well-capitalized Tier One Leverage Capital Required to be Well Capitalized to Average Assets Tier one capital under BaselIII standardized approach Tier one capital under Basel III standardized approach Tier one capital calculated under Basel III standardized approach Basel III Supplementary Leverage Ratio Supplementary Leverage Ratio Carrying Amount of Assets and Liabilities of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] External Debt and Receivable Balances of Securitization Programs Qualitative and Quantitative Information, Transferor's Continuing Involvement [Table Text Block] Financial Instruments Owned and Pledged as Collateral by Type [Axis] Financial Instruments Owned and Pledged as Collateral by Type [Axis] Financial Instruments Owned and Pledged as Collateral, Type [Domain] Financial Instruments Owned and Pledged as Collateral, Type [Domain] Federal Home Loan Bank Advances [Member] Consumer Home Loan [Member] Consumer Home Loan [Member] Consumer Home Loan Retail Banking [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Assets Other Assets [Member] Uncollectible Portion of Billed Finance Charges and Fees Uncollectible Portion of Billed Finance Charges and Fees Uncollectible Portion of Billed Finance Charges and Fees Finance Charge And Fees Reserves Finance Charge And Fees Reserves Finance Charge And Fees Reserves Payments for Origination of Mortgage Loans Held-for-sale Payments for Origination of Mortgage Loans Held-for-sale Loans Pledged as Collateral Loans Pledged as Collateral Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Mortgage loans in process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Threshold Period Past Due for Entering Foreclosure Process Status of Financing Receivables Threshold Period Past Due for Entering Foreclosure Process Status of Financing Receivables Threshold period past due for entering foreclosure process status of financing receivables Real estate acquired through foreclosure Real Estate Acquired Through Foreclosure Minimum loan amount reviewed quarterly by management for further deterioration Loans and Leases Receivable, Minimum Individual Loan Balance Requiring Quarterly Review Loans and Leases Receivable, Minimum Individual Loan Balance Requiring Quarterly Review Minimum loan amount requiring annual review Loans and Leases Receivable, Minimum Individual Loan Balance Requiring Annual Review Loans and Leases Receivable, Minimum Individual Loan Balance Requiring Annual Review Troubled debt restructurings included in impaired loans Financing Receivable, Modifications, Recorded Investment Loans and Leases Receivable, Impaired, Commitment to Lend Loans and Leases Receivable, Impaired, Commitment to Lend Loans Sold Percent Retained Servicing Loans Sold Percent Retained Servicing Loans Sold Percent Retained Servicing Assumptions for benefit obligations at measurement date: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Assumptions for periodic benefit cost for the year ended: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Expected long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Assumptions for year-end valuations: Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] Health care cost trend rate assumed for next year, pre-age 65 Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Pre Age 65 Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Pre Age 65 Health care cost trend rate assumed for next year, post-age 65 Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Post Age 65 Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Post Age 65 Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Year the rate reaches the ultimate trend rate Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Outstanding Balance and Carrying Value of Acquired Securities Certain Loans Acquired in Transfer Accounted for as Debt Securities [Abstract] Outstanding balance Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance Carrying value Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Short-term Debt [Line Items] Short-term Debt [Line Items] Short-term borrowings Short-term Debt Other assets Assets for Plan Benefits, Defined Benefit Plan Other liabilities Liability, Defined Benefit Plan Net amount recognized as of December 31, Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Cash and cash equivalents Investment in subsidiaries Investments in Subsidiaries Investments in Subsidiaries Loans to subsidiaries Receivables From Subsidiaries Receivables From Subsidiaries Total assets Accrued expenses and other liabilities Total stockholders’ equity Total liabilities and stockholders’ equity Defined Contribution Plan [Table] Defined Contribution Plan [Table] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] Associate Savings Plan Associate Savings Plan [Member] Associate Savings Plan [Member] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Defined contribution plan, age eligible to participate Defined Contribution Plan, Age Eligible to Participate Defined Contribution Plan, Age Eligible to Participate Defined contribution plan, cost Defined Contribution Plan, Cost Schedule of Changes in Benefit Obligation and Plan Assets Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Schedule of Amounts Recognized in Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Schedule of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income Schedule of Net Benefit Costs [Table Text Block] Schedule of Pre-Tax Amounts in Accumulated Other Comprehensive Income Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Schedule Of Weighted Average Assumptions Used in Accounting for Plans Schedule of Assumptions Used and Health Care Cost Trend Rates [Table Text Block] Schedule of Assumptions Used and Health Care Cost Trend Rates Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Expected Future Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract] Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract] Effect of one percentage point increase on accumulated postretirement benefit obligation Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Effect of one percentage point decrease on accumulated postretirement benefit obligation Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation Schedule of Intangible Assets by Major Class [Table] Schedule of Intangible Assets by Major Class [Table] Schedule of Intangible Assets by Major Class [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] PCCR intangibles Customer Relationships [Member] Core deposit intangibles Core Deposits [Member] Other Intangible Assets [Member] Other Intangible Assets [Member] Intangible Assets by Major Class [Axis] Intangible Assets by Major Class [Axis] Intangible Assets by Major Class [Axis] Intangible Assets by Major Class [Domain] Intangible Assets by Major Class [Domain] Intangible Assets by Major Class [Domain] Schedule of Intangible Assets by Major Class [Line Items] Schedule of Intangible Assets by Major Class [Line Items] [Line Items] for Schedule of Intangible Assets by Major Class [Table] Goodwill, Gross Goodwill, Gross Intangible Assets, Gross (Excluding Goodwill) Intangible Assets, Gross (Excluding Goodwill) Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Intangible Assets Gross Including Goodwill Intangible Assets Gross Including Goodwill Intangible Assets Gross Including Goodwill Total goodwill and other intangible assets, Net Carrying Value Intangible Assets, Net (Including Goodwill) Commercial MSRs, Gross Mortgage Servicing Asset at Amortized Cost, Gross Mortgage Servicing Asset at Amortized Cost, Gross Commercial MSR, Accumulated Amortization Servicing Asset at Amortized Cost, Accumulated Amortization Servicing Asset at Amortized Cost, Accumulated Amortization Total MSRs, Gross Servicing Asset, Gross Servicing Asset, Gross Servicing Asset at Amortized Cost Servicing Asset at Amortized Cost Total MSRs, Net Servicing Asset Servicing Asset at Amortized Cost, Amortization Servicing Asset at Amortized Cost, Amortization Finite-Lived Intangible Assets, Remaining Amortization Period Finite-Lived Intangible Assets, Remaining Amortization Period Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Loans Held for Investment Loans Held For Investment [Member] Loans held for investment. Appraisal Value Appraisal Value [Member] Appraisal value. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Non-recoverable rate Fair Value Inputs Non Recoverable Rate Amount cannot be recovered through foreclosure or bankruptcy procedures in event of a default, expressed as a percentage of face value. Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Other Assets, Fair Value Disclosure Other Assets, Fair Value Disclosure Total Assets, Fair Value Disclosure, Nonrecurring Foreclosed Properties and Repossessed Assets Other Real Estate, Foreclosed Assets, and Repossessed Assets Long Lived Assets Held for Sale Assets Held-for-sale, Long Lived, Fair Value Disclosure Schedule of Significant Components of Provision for Income Taxes Attributable to Continuing Operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Significant Components of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Reconciliation of Change in Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] US Treasury securities Securities available for sale: Available-for-sale Securities [Abstract] Other assets: Other Assets, Fair Value Disclosure [Abstract] Other Assets, Fair Value Disclosure [Abstract] Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Other Assets Fair Value, Amount Other Assets Fair Value, Amount Other assets that were recorded at fair value on the consolidated balance sheets, including Consumer Mortgage Servicing rights, Retained interest in securities trust and deferred compensation plan assets Retained interests in securitizations Deferred Compensation Plan Assets Deferred Compensation Plan Assets Total assets Assets, Fair Value Disclosure Liabilities: Financial Liabilities Fair Value Disclosure [Abstract] Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset Total liabilities Financial Liabilities Fair Value Disclosure Derivative Credit Risk Valuation Adjustment, Derivative Assets (Liabilities) Derivative Credit Risk Valuation Adjustment, Derivative Assets (Liabilities) Derivative Credit Risk Valuation Adjustment, Derivative Assets (Liabilities)