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Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Common stock, dividends declared (in usd per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Due within 1 year Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Debt securities AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Senior and subordinated unsecured notes Senior Notes Allowance for Credit Losses on Financing Receivables Financing Receivable, Allowance for Credit Loss [Table Text Block] 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Expense [Abstract] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Smaller Reporting Company Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total Financing Receivable, Modified, Subsequent Default Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Minimum to be well-capitalized under prompt corrective action provisions (percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Net interest income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Document Type Document Type 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] Fair Value as of Grant Date Award Grant Date Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Other Unallocated Financing Receivables [Member] Actual (percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Earnings before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Retailer share arrangements Retailer Share Arrangements Retailer Share Arrangements Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Receivable Type [Axis] Receivable Type [Axis] Loan return to current status, number of consecutive monthly program payments received Loan Return to Current Status, Number Of Consecutive Monthly Program Payments Received Loan Return to Current Status, Number Of Consecutive Monthly Program Payments Received Total Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Equity Liabilities and Equity [Abstract] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Marketing and business development Marketing and Business Development Expense Marketing and Business Development Expense Due after 10 years Debt Securities, Available-for-Sale, Maturity, Rolling after 10 Years, Weighted Average Yield Reversion period Financing Receivable, Allowance for Credit Loss, Reversion Period Financing Receivable, Allowance for Credit Loss, Reversion Period PEO Name PEO Name Originated fiscal year before current fiscal year, charge-off Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Senior and subordinated unsecured notes Unsecured Debt [Abstract] Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Restricted cash Restricted Cash Contract with customer, liability Contract with Customer, Liability Other segment items Segment Reporting, Other Segment Item, Amount Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Maturities and repayment of securitized debt Repayments of Secured Debt Other assets (Note 6) Total other assets Other Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Past Due Financing Receivables Financing Receivable, Past Due [Table Text Block] Financial Asset, Not Past Due Financial Asset, Not Past Due [Member] Actual Banking Regulation, Total Capital, Actual Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount Other income: Noninterest Income [Abstract] Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Cash and equivalents, including restricted amounts, at beginning of period Total cash and equivalents, including restricted amounts, at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Residential Mortgage Backed Securities pledged as collateral to the Federal Reserve Residential Mortgage Backed Securities pledged as collateral to the Federal Reserve Residential Mortgage Backed Securities pledged as collateral to the Federal Reserve Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Interest expense: Interest Expense, Operating and Nonoperating [Abstract] Employee costs Labor and Related Expense Due after 10 years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Net (increase) decrease in loan receivables, including held for sale Payments for (Proceeds from) Loans and Leases Schedule of Debt Schedule of Debt [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in usd per share) Earnings per basic common share (in usd per share) Earnings Per Share, Basic Purchases of treasury stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Originated more than five years before current fiscal year, charge-off Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff Retained earnings Retained Earnings (Accumulated Deficit) Common equity, actual (percent) Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Interest payable, fair value Interest Payable Fair Value Disclosure Interest Payable Fair Value Disclosure Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Proceeds from issuance of securitized debt Proceeds from Issuance of Secured Debt Common Stock Common Stock [Member] Maturities of Time Deposits [Abstract] Maturities of Time Deposits [Abstract] Debt securities (Note 3) Estimated fair value Debt Securities, Available-for-Sale Fair Value Measurement [Domain] Fair Value Measurement [Domain] Regulatory Capital Requirements Under Banking Regulations By Measurement [Axis] Regulatory Capital Requirements Under Banking Regulations By Measurement [Axis] Regulatory Capital Requirements Under Banking Regulations By Measurement [Axis] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Tier 1 risk-based capital Banking Regulation, Tier 1 Risk-Based Capital [Abstract] Cover [Abstract] Cover [Abstract] Uncommitted Capacity Uncommitted Capacity [Member] Uncommitted Capacity Change in Presentation Reclassification, Comparability Adjustment [Policy Text Block] Brokered Interest-Bearing Domestic Deposit, Certificates of Deposits, Brokered Interest-Bearing Domestic Deposit, Certificates of Deposits, Brokered Series B Preferred Stock Series B Preferred Stock [Member] Deferred costs and purchase discounts, net of deferred (income) Financing Receivable, Deferred Commitment Fee, Net Of Deferred (Income) Financing Receivable, Deferred Commitment Fee, Net Of Deferred (Income) Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Stock-based compensation APIC, Share-Based Payment Arrangement, Recognition and Exercise Equity Securities without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Table Text Block] Equity Awards Adjustments Equity Awards Adjustments [Member] Financial Asset, Past Due Financial Asset, Past Due [Member] Due within 1 year Debt Securities, Available-for-Sale, Maturity, Rolling within One Year, Weighted Average Yield Percentage of class of loan receivable Financing Receivable, Credit Quality Indicators, Percentage of Class of Loan Receivable Financing Receivable, Credit Quality Indicators, Percentage of Class of Loan Receivable Total liabilities and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Proceeds from issuance of preferred stock Proceeds from Issuance of Preferred Stock and Preference Stock Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Thereafter Time Deposit Maturities, After Year Four Time Deposit Maturities, After Year Four Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Due after 5 years through 10 years Debt Securities, Available-for-Sale, Maturity, Rolling after 5 through 10 Years, Weighted Average Yield Other Debt Obligations Other Debt Obligations [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Due after 1 year through 5 years Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Business Combination, Contingent Consideration, Type [Domain] Business Combination, Contingent Consideration, Type [Domain] Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Fixed Securitized Borrowings Fixed Securitized Borrowings [Member] Fixed Securitized Borrowings [Member] Total Debt Securities, Available-for-Sale, Weighted Average Yield Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock, par value $0.001 per share; 300 million shares authorized, 1.26 million and 1.25 million shares issued and outstanding at September 30, 2026 and December 31, 2025, respectively (Note 12) Preferred stock issued Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Time deposit liability, uninsured Time Deposit Liability, Uninsured Percentage of total loan receivables Financing Receivable, Percent Past Due Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Accumulated other comprehensive income (loss): Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Other commitments Other Commitment Schedule of Preferred Stock Schedule of Stock by Class [Table Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total Assets, Fair Value Disclosure Six Hundred and Fifty-One or Higher Six Hundred and Fifty-One or Higher [Member] Six Hundred and Fifty-One or Higher Modified loans success rate Financing Receivable, Modification, Success Rate, Short-term Financing Receivable, Modification, Success Rate, Short-term Other income Noninterest Income, Excluding Gain (Loss) On Sale Of Business And Financing Receivables Noninterest Income, Excluding Gain (Loss) On Sale Of Business And Financing Receivables Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Preferred Stock, Dividend Payment Rate, Variable Preferred Stock, Dividend Payment Rate, Variable Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Interest and fees on loans (Note 4) Interest and fees on loans Interest and Fee Income, Financing Receivable Tax credits and other benefits of affordable housing properties investments Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Due within 1 year Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Name Trading Arrangement, Individual Name Cash and equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Due after 1 year through 5 years Debt Securities, Available-for-Sale, Maturity, Rolling after One Through Five Years, Weighted Average Yield Originated two years before current fiscal year, charge-off Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Deposits [Abstract] Deposits [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Borrowings: (Notes 5 and 8) Long-Term Debt, Excluding Current Maturities [Abstract] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Portion that, if recognized, would reduce tax expense and effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Non-PEO NEO Non-PEO NEO [Member] Tier 1 leverage Banking Regulation, Tier 1 Leverage Capital [Abstract] Senior unsecured notes Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Provision for income taxes (Note 13) Provision for income taxes Income Tax Expense (Benefit) Total other expense Noninterest Expense Investments Funding Commitment Investments Funding Commitment [Member] Investments Funding Commitment Award Timing Method Award Timing Method [Text Block] Interim Period Presentation Consolidation, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Variable Interest Entity, Primary Beneficiary Restricted loans of consolidated securitization entities Variable Interest Entity, Primary Beneficiary [Member] Deposits: (Note 7) Deposits, Interest-Bearing and Noninterest-Bearing, Alternative [Abstract] Net earnings Net earnings Net earnings Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] Originated fiscal year before current fiscal year Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Minimum to be well-capitalized under prompt corrective action provisions (percent) Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Restatement Determination Date: Restatement Determination Date [Axis] Troubled Debt Restructurings on Financing Receivables, Subsequent Default Troubled Debt Restructurings on Financing Receivables, Subsequent Default [Table Text Block] Troubled Debt Restructurings on Financing Receivables, Subsequent Default [Table Text Block] Capital conservation buffer Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Schedule of Other Assets Schedule of Other Assets [Table Text Block] Loyalty programs Noninterest Expense, Loyalty Programs Noninterest Expense, Loyalty Programs Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]