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Dec 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Increase (decrease) in other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Hedging Designation [Domain] Hedging Designation [Domain] 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 Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Allowance for credit loss, reasonable and supportable forecast period (in year) Financing Receivable, Allowance For Credit Loss, Reasonable And Supportable Forecast Period Financing Receivable, Allowance For Credit Loss, Reasonable And Supportable Forecast Period Newco Steel Newco Inc. [Member] Steel Newco Inc. Aggregate Available Trading Arrangement, Securities Aggregate Available Amount All financing receivable, allowance for credit loss All Financing Receivable, Allowance For Credit Loss All Financing Receivable, Allowance For Credit Loss Mutual funds held in rabbi trusts Mutual Funds Held In Rabbi Trusts In Assets Mutual Funds Held In Rabbi Trusts In Assets Name Measure Name Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Schedule of Pre-Tax Effect of Changes in Fair Value from Derivative Instruments Not Designated as Hedging Instruments Effect Of Fair Value Hedges On The Consolidated Statements Of Income [Table Text Block] Schedule of Effect of Fair Value Hedges on the Consolidated Statements of Income Schedule of Effect of Hedging Derivative Instruments in the Consolidated Statements of Income Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Securities purchased with agreement to resell Securities Purchased under Agreements to Resell Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total preliminary consideration Business Combination, Consideration Transferred Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Unrealized loss on securities Total, fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Name Trading Arrangement, Individual Name Financing Receivable, Nonaccrual [Line Items] Financing Receivable, Nonaccrual [Line Items] Pre-tax income (loss) recognized on cash flow hedges Gain (Loss) on Derivative Instruments, Net, Pretax Investment securities gains (losses), net Debt and Equity Securities, Gain (Loss) Company Selected Measure Amount Company Selected Measure Amount Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Dividends received from equity method investment Proceeds from Equity Method Investment, Distribution Derivatives Not Designated as Hedging Instruments Not Designated as Hedging Instruments Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Equity Method Investments and Joint Ventures [Abstract] Deposits: Deposits [Abstract] Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 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] Commitments to land additional funds to TDRs Commitments To Lend Additional Funds To TDRs Commitments To Lend Additional Funds To TDRs Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Investment securities HTM, Fair value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Income tax expense Income Tax Expense (Benefit) Total non-interest expense Noninterest Expense Gain (loss) on fair value hedges recognized on termination Gain (Loss) on Fair Value Hedges Recognized in Earnings Fair Value Hedges Fair Value Hedging [Member] Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E [Member] Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Consolidation Consolidation, Policy [Policy Text Block] Increase (decrease) in cash and cash equivalents including restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Total Charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Weighted Average Term Extension and Payment Delay (in months) Financing Receivable, Modified, Weighted Average Term Extension And Payment Delay From Modification Financing Receivable, Modified, Weighted Average Term Extension And Payment Delay From Modification Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Accrued interest receivable on investment securities available for sale Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Loans Business Combination, Recognized Asset Acquired, Loans, Before Allowance For Credit Loss Business Combination, Recognized Asset Acquired, Loans, Before Allowance For Credit Loss Term loans amortized cost basis by origination, before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Schedule of Current, Accruing Past Due, and Non-Accrual Loans by Portfolio Class Financing Receivable, Nonaccrual [Table Text Block] Liabilities assumed: Business Combination, Recognized Liability Assumed, Liability [Abstract] Reclassification adjustment for accretion of unrealized holding gains on HTM securities, net of tax OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax Commitments under home equity lines of credit Commitments Under Home Equity Lines Of Credit [Member] Commitments under Home Equity Lines of Credit [Member] Terminated cash flow hedge, unrealized gains in OCI AOCI, Cash Flow Hedge, Cumulative Gain (Loss), After Tax, Terminated AOCI, Cash Flow Hedge, Cumulative Gain (Loss), After Tax, Terminated Loans held-for-sale, fair value disclosure Loan, Held-for-Sale, Fair Value Disclosure Expected allowance for credit losses Allowance for loan losses Business Combination, Recognized Asset Acquired, Allowance for Credit Losses Business Combination, Recognized Asset Acquired, Allowance for Credit Losses Interest income: Revenues [Abstract] Derivative asset, notional amount, terminated Derivative Asset, Notional Amount, Terminated Derivative Asset, Notional Amount, Terminated Basis of Presentation and Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]