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Risk, Percentage Year two, originated, fiscal year before current fiscal year, writeoff Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Unrealized gains and losses on derivatives: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Pass/Watch Pass [Member] Schedule of Loans Held for Investment Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Contingent litigation reserves Loss Contingency Accrual, Loss (Reversal of Loss) Total long-term borrowings Other Long-Term Debt Retiree benefits eliminated if less than service period, years (less than) Service Period Eliminations Of Retiree Benefits Operating cash flows from operating leases Short-Term Lease Payments Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Less than 90 days Past Due Less than 90 days Past Due [Member] Less than 90 days Past Due Hedging Designation [Domain] Hedging Designation [Domain] Statement of Cash Flows [Abstract] Negotiable Order of Withdrawal ("NOW") Deposits, Negotiable Order of Withdrawal (NOW) Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Gain recognized calls on sale of securities Debt Securities, Calls Of Available-for-Sale, Realized Gain Debt Securities, Calls Of Available-for-Sale, Realized Gain Available for sale debt securities, equity securities and Federal Home Loan Bank stock Interest Income, Debt Securities, Available-for-Sale, Operating Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Total, fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Revenue Not From Contracts With Customer Products and Services, Revenue Not From Contracts With Customer [Member] Products and Services, Revenue Not From Contracts With Customer Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Financing Receivables, Period Past Due [Axis] Financial Asset, Aging [Axis] Derivatives not designated as a hedging instrument: Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Deposits: Deposits [Abstract] A Rated or Not Rated Fitch, A Rating Or Not Rated [Member] Fitch, A Rating Or Not Rated Derivative liabilities Net derivative amounts presented on the balance sheet Derivative Liability Change in Payment Type Change In Payment Type [Member] Change In Payment Type Entity Address, Address Line One Entity Address, Address Line One Fair value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Income tax expense Income tax expense Income Tax Expense (Benefit) Premiums on purchased loans Financing Receivable, Unamortized Purchase Premium (Discount) Liability Derivatives Offsetting Derivative Liabilities [Abstract] Loans charged-off Total Loans Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] Stock options exercised Proceeds from Stock Options Exercised 2025 2024 Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Total gross derivative amounts recognized on the balance sheet Derivative Asset, Subject to Master Netting Arrangement, before Offset Derivatives, Fair Value [Line Items] Derivative Instruments and Hedging Activities Disclosure [Abstract]