Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Subordinated notes Subordinated Debt Fair Value Measurements Portion at Fair Value Measurement [Member] Derivative assets Offsetting Derivative Assets [Abstract] Title of 12(b) Security Title of 12(b) Security Carrying Amount Reported Value Measurement [Member] Commercial Commercial Real Estate Excluding Residential Builder And Developer And Other Construction [Member] Commercial real estate excluding residential builder and developer and other construction. Subsequent Event Subsequent Event [Member] Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Diluted Net income available to common shareholders Net Income (Loss) Available to Common Stockholders, Diluted Hedged item Derivative Assets (Liabilities), at Fair Value, Net Weighted-Average Rate Debt, Weighted Average Interest Rate Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Net charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) Adjustment to Compensation, Amount Adjustment to Compensation Amount Pledged Status [Axis] Pledged Status [Axis] Financial Instrument Financial Instrument [Axis] Other assets Other Assets, Fair Value Disclosure Segment Reporting [Abstract] Segment Reporting [Abstract] Other residential real estate Commitments To Extend Credit For Other Residential Real Estate Commitments to extend credit for other residential real estate. Pension plans and other postretirement benefits Retirement Benefits [Text Block] Loss contingency accrual Loss Contingency Accrual Interest received during the period Proceeds from Interest Received M&T Bank M&T Bank [Member] M&T Bank Derivative Instrument Derivative Instrument [Axis] Other comprehensive income (loss) before reclassifications, tax Other Comprehensive Income (Loss) before Reclassifications, Tax Residential mortgage loan servicing rights Beginning balance Ending balance Servicing Asset at Fair Value, Amount Maturity Period 2026 Maturity Period Two [Member] Maturity Period Two [Member]. Financing receivable, accrued interest, before allowance for credit loss Financing Receivable, Accrued Interest, before Allowance for Credit Loss U.S. Treasury US Treasury and Government [Member] Consolidated Entities Consolidated Entities [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Reclassification [Table] Reclassification [Table] Guaranteed by Government-Related Entities Loans Insured or Guaranteed by US Government Authorities [Member] Other comprehensive income (loss), net of tax and reclassification adjustments: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Contractual Interest Rate Reduction [Member] Credit Spread Measurement Input, Credit Spread [Member] Loans (a) Total Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Consolidated Entities Consolidated Entities [Domain] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Mortgage Banking Revenues Mortgage Banking Revenues [Member] Mortgage Banking Revenues Residential builder and developer Residential Builder And Developer [Member] Residential builder and developer. Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Common stock par value (in USD per share) Common Stock, Par or Stated Value Per Share Debt Instrument, Redemption, Period Debt Instrument, Redemption, Period [Axis] Financing Receivable, Modified Financing Receivable, Modified [Table Text Block] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Remaining Loan Collateral Balance Debt Instrument, Collateral Amount Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total debt securities gross unrealized losses Investment In Debt Securities Gross Unrealized Losses Investment in debt securities gross unrealized losses. Capitalized servicing rights, valuation allowance Servicing Asset at Amortized Cost, Increase (Decrease) for Valuation Allowance Adjustment Number of Reportable Segments Number of Reportable Segments Criticized accrual Criticized Accrual [Member] Criticized accrual. Servicing asset at fair value, period increase, net of tax Servicing Asset At Fair Value, Period Increase (Decrease), Net Of Tax Servicing Asset At Fair Value, Period Increase (Decrease), Net Of Tax Beginning balance Servicing Asset at Amortized Cost Cash flow hedge loss to be reclassified within 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Entity Address, City or Town Entity Address, City or Town Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Indirect expense Indirect Expense (Income) Indirect Expense (Income) Year one Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Core deposit and other intangible assets Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Accruing Loans Past Due 90 Days or More Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Total available for held to maturity (fair value) Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Changes in fair value Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Subsequent Event Type [Axis] Subsequent Event Type [Axis] Cash flow hedges adjustments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Loans And Leases Receivable [Line Items] Loans And Leases Receivable [Line Items] Loans and leases receivable. Recreational finance loans Recreational Finance Loans [Member] Recreational Finance Loans Variable Derivative, Average Variable Interest Rate OCI, before Reclassifications, before Tax, Attributable to Parent OCI, before Reclassifications, before Tax, Attributable to Parent Information about Company's Segments Segment Reporting [Table Text Block] Exchange Cleared Exchange Cleared [Member] Other comprehensive income (loss), net of Tax, Portion attributable to parent Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Time deposits above US insurance limit Time Deposit Liability, above US Insurance Limit Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Supplemental schedule of noncash investing and financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Allowance for loan losses Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Document Period End Date Document Period End Date Other Other Loans [Member] Other loans. Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Face amount Asset-Backed Notes to Investors Debt Instrument, Face Amount Revolving Loans Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Term (in years) Weighted-Average Life (In years) Debt Instrument, Term Gross realized losses Debt Securities, Available-for-Sale, Realized Loss Fair Value Measurements Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Trading Activity, by Type Trading Activity, by Type [Domain] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Brokerage services income Brokerage Commissions Revenue Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items Consolidation Items [Domain] Variable interest entities and asset securitizations Variable Interest Entities And Asset Securitizations [Text Block] Variable interest entities and asset securitizations. Percent of Total Loan Class Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Equipment finance loans and leases Equipment Finance Loans And Leases [Member] Equipment Finance Loans And Leases Total debt securities amortized cost Investment In Debt Securities Amortized Cost Investment in debt securities amortized cost. Earnings per common share Earnings Per Share [Text Block] Net income per common share Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Due in one year or less Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Total liabilities Liabilities Trading Symbol Trading Symbol Investment securities available for sale: Debt Securities, Available-for-Sale, Excluding Accrued Interest Information about Interest Rate Swap Agreements Schedule of Interest Rate Derivatives [Table Text Block] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Company Selected Measure Name Company Selected Measure Name Investment securities available for sale Payments to Acquire Debt Securities, Available-for-Sale Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Brokerage services income Brokerage Services Income [Member] Brokerage Services Income Due after one year through five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Tricolor Holdings, LLC Tricolor Holdings, LLC [Member] Tricolor Holdings, LLC Year one Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Savings and interest-checking deposits Savings And Interest Checking Deposits Amount of domestic interest-bearing checking and savings accounts, which may include money market accounts, NOW accounts, interest-bearing corporate checking accounts, brokered deposits and other savings accounts. Cost method equity securities Equity Securities, FV-NI, Cost Credit Facility Credit Facility [Domain] Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Fictitious loans Commitments And Contingencies, Fictitious Loans Commitments And Contingencies, Fictitious Loans Net change in interest-bearing deposits at banks Proceeds from (Payments for) in Interest-Bearing Deposits in Banks Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Disposal Group Name [Domain] Disposal Group Name [Domain] Deferred income taxes and credits Deferred Income Taxes and Tax Credits Financing Receivable, Modifications [Line Items] Financing Receivable, Modified [Line Items] Available line of credit Line of Credit Facility, Current Borrowing Capacity Unrealized Losses Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss Mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Net change in other accrued income and expense Increase (Decrease) in Other Operating Assets and Liabilities, Net Award Timing Predetermined Award Timing Predetermined [Flag] Commitments to sell real estate loans Commitments To Sell Real Estate Loans [Member] Commitments to sell real estate loans. Interest income Interest and Dividend Income, Operating [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Revenues from sub-servicing Revenues From Subservicing Revenues from sub-servicing Level 1 Fair Value, Inputs, Level 1 [Member] Interest Payments On Variable Rate Commercial Real Estate Loans Interest Payments On Variable Rate Commercial Real Estate Loans [Member] Interest payments on variable rate commercial real estate loans. Total investment securities, 12 months or longer, fair value Investment Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value This item represents the fair value of securities that have been in a continuous loss position for twelve months or longer. Total Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Plus: Incremental shares from assumed conversion of stock-based compensation awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Reclassification [Line Items] Reclassification [Line Items] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Residential (b) Residential Residential Mortgage-Backed Securities [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Total available for sale (amortized cost) Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Commitments to originate real estate loans for sale Mortgage Related Commitments To Originate Real Estate Loans For Sale [Member] Mortgage related commitments to originate real estate loans for sale. Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Revolving Loans Converted to Term Loans Revolving Loans Converted To Term Loans [Member] Revolving loans converted to term loans. Investment securities Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Credit facility drawn Long-Term Line of Credit Dividends paid — common Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Net change in cash, cash equivalents and restricted cash Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Hedging Relationship Hedging Relationship [Axis] Gross unrealized gains for held to maturity Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Net Amount Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction Subordinated Debt Subordinated Debt [Member] Range of reasonably possible losses Loss Contingency, Estimate of Possible Loss Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Reduction in estimated fair value of interest rate contracts in asset position Increase Decrease In Estimated Fair Value Of Interest Rate Contracts In Asset Position Increase (decrease) in estimated fair value of interest rate contracts in asset position. Available-for-sale, transfer to held-to-maturity, gain Debt Securities, Available-for-Sale, Transfer to Held-To-Maturity, Gain Debt Securities, Available-for-Sale, Transfer to Held-To-Maturity, Gain Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segments Segments [Domain] Maximum exposure to loss of investments in real estate partnerships Maximum Exposure To Loss Of Investments In Real Estate Partnerships Maximum exposure to loss of investments in real estate partnerships. Interest rate swap agreements Interest Rate Swap [Member] Borrowings Debt Disclosure [Text Block] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Commercial Bank Commercial Banking [Member] Commercial banking segment. PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Fair value election — residential mortgage loan servicing right Fair Value Election, Residential Mortgage Loan Servicing Right Assets Fair Value Election, Residential Mortgage Loan Servicing Right Assets Mortgage loans held for sale Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Debt securities available for sale: Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Residential real estate loans to be sold Commitments To Extend Credit For Residential Real Estate Loans To Be Sold Commitments to extend credit for residential real estate loans to be sold. Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Common stock cash dividends Dividends, Common Stock, Cash Total shareholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Assets Assets [Abstract] Term Extension Payment Deferral [Member] Investment securities, available for sale, amortized cost Investment securities available for sale, amortized cost Debt Securities, Available-for-Sale, Amortized Cost Professional and other services Professional Fees Insider Trading Policies and Procedures [Line Items] Recreational finance Recreational Finance [Member] Recreational finance. Investment in partnership carrying amount Investments In Variable Interest Entity Carrying Amount The carrying amount of investments in variable interest entity. Provision for deferred income taxes Deferred Income Tax Expense (Benefit) Commercial real estate Commercial Real Estate Portfolio Segment [Member] Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Domain] Equity and other securities (cost: $1,093 at June 30, 2026; $1,016 at December 31, 2025) Equity and other securities, estimated fair value Equity And Other Securities Estimated Fair Value Equity and other securities estimated fair value. Measurement input Servicing Asset, Measurement Input Trading Account And Other Non Hedging Derivatives Trading Account And Other Non Hedging Derivatives [Member] Trading Account And Other Non Hedging Derivatives Number of Operating Segments Number of Operating Segments Antidilutive securities excluded from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Over-the-Counter Over-the-Counter [Member] Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Merchant discount and credit card interchange fees Credit Card, Merchant Discount [Member] Pledging Purpose [Axis] Pledging Purpose [Axis] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Investment, Name Investment, Name [Axis] Preferred stock cash dividends Dividends, Preferred Stock, Cash Designated as Hedging Instrument Designated as Hedging Instrument [Member] Preferred Series G Series G Preferred Stock [Member] Preferred stock dividend rate (as a percent) Preferred Stock, Dividend Rate, Percentage Reduction in estimated fair value of interest rate contracts in liability position Increase Decrease In Estimated Fair Value Of Interest Rate Contracts In Liability Position Increase (decrease) in estimated fair value of interest rate contracts in liability position. Schedule Of Financing Receivable Troubled Debt Restructurings [Table] Financing Receivable, Modified [Table] Variable rate Debt Instrument, Basis Spread on Variable Rate Commitments to extend credit Commitments To Extend Credit [Abstract] Commitments to extend credit. Amortized Cost without Allowance Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance Accumulated Other Comprehensive Income (Loss), Net AOCI Attributable to Parent AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Privately issued Mortgage-Backed Securities, Issued by Private Enterprises [Member] Realized Gain (Loss) on Investments Realized Gain (Loss) on Investments [Table Text Block] Readily marketable securities gross unrealized gains Readily Marketable Securities At Fair Value Gross Unrealized Gains Readily marketable securities at fair value gross unrealized gains. Previously Reported Previously Reported [Member] Statement [Line Items] Statement [Line Items] Total assets Total assets of partnerships in which the company invested Assets Schedule Of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Total interest expense Interest Expense, Operating Internal Credit Assessment Internal Credit Assessment [Domain] Operating Segments Operating Segments [Member] Investment securities available for sale, gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value OCI, before reclassifications, net of tax, attributable to parent OCI, before Reclassifications, Net of Tax, Attributable to Parent Equipment and net occupancy Occupancy, Net PEO PEO [Member] Investment Securities in Continuous Unrealized Loss Position Investment Securities In Continuous Unrealized Loss Position [Table Text Block] Investment securities in continuous unrealized loss position. Fair Value Investment Securities Continuous Unrealized Loss Position Investment Securities Continuous Unrealized Loss Position Goodwill Goodwill Retirement Plan Type Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Retained Earnings Retained Earnings [Member] Revolving Loans Revolving Credit Facility [Member] Loans secured by residential real estate that were in the process of foreclosure Residential Mortgage Loans Secured By Residential Real Estate In Process Of Foreclosure Residential mortgage loans secured by residential real estate in process of foreclosure. Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) Fair Value, by Balance Sheet Grouping [Table Text Block] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Diluted (in USD per share) Diluted earnings per common share (in USD per share) Earnings Per Share, Diluted Internal Credit Assessment Internal Credit Assessment [Axis] FDIC assessments Federal Deposit Insurance Corporation Premium Expense Redemption of Series G preferred stock Stock Redeemed or Called During Period, Value Retail Bank Retail Banking [Member] Retail banking segment. Equity, attributable to parent, beginning balance Equity, attributable to parent, ending balance Equity, attributable to parent, before tax Equity, Attributable to Parent, Before Tax Equity, Attributable to Parent, Before Tax Amortization of core deposit and other intangible assets Intangible Asset, Finite-Lived, Amortization Expense Year four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Offsetting Assets Offsetting Assets [Table Text Block] Reclassification from AOCI, current period, tax Reclassification from AOCI, Current Period, Tax Revenue from contract with customer Revenue from Contract with Customer, Excluding Assessed Tax Schedule of Financial Instruments Owned and Pledged as Collateral Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Commercial real estate loans to be sold Commitments To Extend Credit For Commercial Real Estate Loans To Be Sold Commitments to extend credit for commercial real estate loans to be sold. 30-89 days past due Financial Asset, 30 to 89 Days Past Due [Member] Financial Asset, 30 to 89 Days Past Due Repurchase agreements Short-term borrowings Federal Funds Purchased and Securities Sold under Agreements to Repurchase Cash and due from banks Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Equity and other securities, cost Equity and other securities, cost Equity And Other Securities At Cost Equity and other securities at cost. Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Service charges on deposit accounts Deposit Account [Member] Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] February 2025 Asset Backed Notes February 2025 [Member] Asset Backed Notes February 2025 Schedule Of Equity Method Investments [Table] Equity Method Investment [Table] Derivatives in fair value hedging relationships, derivative Derivative, Gain (Loss) on Derivative, Net Equity and other securities Payments To Acquire Equity And Other Securities Investments Payments to acquire equity and other securities investments. Uncollected amounts receivable Revenue, Remaining Performance Obligation, Amount Loans Insured or Guaranteed by Government Authorities [Domain] Loans Insured or Guaranteed by Government Authorities [Domain] Collateral Held Collateral Held [Axis] Schedule Of Borrowings [Table] Schedule Of Borrowings [Table] Schedule of borrowings. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Revolving Loans Financing Receivable, Excluding Accrued Interest, Revolving Asset write-downs Asset, Impairment Loss Changes in Allowance for Credit Losses Financing Receivable, Allowance for Credit Loss [Table Text Block] Common stock issued (in shares) Common Stock, Shares, Issued Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans Loan And Leases Considered Nonaccrual And Interest Income Recognized On Loans [Table Text Block] Loan and leases considered nonaccrual and interest income recognized on loans. AFS, 12 months or longer, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Comprehensive income Comprehensive Income (Loss) Note [Text Block] Net income available to common equity Net Income Loss Available To Common Stockholders Diluted Before Unvested Stock Based Compensation Awards Adjustment Net income loss available to common stockholders before unvested stock based compensation awards adjustment as used in the determination of diluted earnings per common share. Product and Service Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Stock-based compensation transactions, net Share Based Compensation Expense Net The adjustment to common stock or additional paid in capital for the amount of recognized equity-based compensation during the period. Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Unrealized Losses Investment Securities Continuous Unrealized Loss Position, Aggregate Losses Investment Securities Continuous Unrealized Loss Position, Aggregate Losses Other expense Noninterest 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] Outstanding principal balances of mortgage servicing rights Mortgage Loans Of Privately Held Company Mortgage servicing rights of commercial mortgage loans with outstanding principal balances of privately held commercial mortgage company. Advertising and marketing Marketing and Advertising Expense Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Less: Income attributable to unvested stock-based compensation awards Income Attributable To Unvested Stock Based Compensation Awards Basic Income attributable to unvested stock based compensation awards. This amount is used as a reduction to net income available to common equity in the calculation of net income available to common shareholders as used in the determination of basic earnings per common share. Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Not subject to master netting agreements (c) Derivative Asset, Not Subject to Master Netting Arrangement Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Defined benefit plans liability adjustments Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Net change in loan servicing advances Net Increase Decrease In Loan Servicing Advances The net cash outflow or inflow for the increase (decrease) of loan servicing advances. Fair Value as of Grant Date Award Grant Date Fair Value Transaction Market Method [Domain] Transaction Market Method [Domain] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Unamortized loan cost (fee) and purchase premium (discount) Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) Intersegment Activity Eliminated in Consolidated Totals Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name AFS, less than 12 months, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total revenue Revenues Income from equity method investments Income (Loss) from Equity Method Investments Number of debt securities with aggregate gross unrealized losses Number Of Debt Securities With Gross Losses Number of debt securities with gross losses. Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Loan Restructuring Modification Loan Restructuring Modification [Axis] Total available for sale (fair value) Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Investment securities: Marketable Securities [Abstract] All Award Types Award Type [Domain] Fair value measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Contract with customer Contract with Customer, Liability 30-89 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Legal Entity [Axis] Legal Entity [Axis] Summary of Loan grades applied various classes of Commercial and Real Estate Loans Summary Of Loan Grades Applied Various Classes Of Commercial And Real Estate Loans [Table Text Block] Summary of loan grades applied various classes of commercial and real estate loans. Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Other income Noninterest Income [Abstract] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Collateral Derivative Asset, Not Subject To Master Netting Arrangement, Collateral, Right To Reclaim Cash Offset Derivative Asset, Not Subject To Master Netting Arrangement, Collateral, Right To Reclaim Cash Offset Beginning balance Ending balance Equity, Attributable To Parent, Tax Equity, Attributable To Parent, Tax Non-NEOs Non-NEOs [Member] Ownership percentage (as a percent) Equity Method Investment, Ownership Percentage Short-term borrowings Debt, Current [Abstract] Modified past due 90 days or more Delinquency Status of Loans and Leases Receivable Modified Past Due Ninety Days or More Delinquency status of loans and leases receivable modified past due ninety days or more. Debt securities held to maturity: Debt Securities, Held-to-Maturity, Fair Value, Maturity [Abstract] Other commercial construction Other Commercial Construction [Member] Other commercial construction. Schedule of Borrowings Schedule of Asset-Backed Notes Issued to Investors Schedule of Debt [Table Text Block] Investment, Name Investment, Name [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards (in shares) Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards (in shares) Common Shares Outstanding Including Common Stock Issuable And Unvested Stock Based Compensation Awards The weighted average number of common shares outstanding (including common stock issuable) and unvested stock-based compensation awards. Bayview Financial Bayview Financial [Member] Bayview Financial. Purchases of treasury stock Payments for Repurchase of Common Stock Statistical Measurement Statistical Measurement [Axis] Advances from FHLB Long-Term Federal Home Loan Bank Advances Information about Fair Values of Derivative Instruments in Consolidated Statement of Income Derivative Instruments, Gain (Loss) [Table Text Block] Award Type Award Type [Axis] Interest Rate Contracts Interest Rate Contract [Member] Other Projects Other Projects [Member] Other Projects Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Derivatives in fair value hedging relationships, hedged item Gain Loss On Hedged Item In Fair Value Hedge Aggregate net gain and losses (whether realized or unrealized) of the hedged item in a fair value hedge recognized in the income statement. Retained earnings Retained Earnings (Accumulated Deficit) Consumer Consumer Portfolio Segment [Member] Product and Service Product and Service [Axis] Available-for-sale securities transferred to held-to-maturity Debt Securities, Available-For-Sale Securities Transferred To Held-To-Maturity Debt Securities, Available-For-Sale Securities Transferred To Held-To-Maturity Loans Payments to Acquire Loans Receivable Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] March 2024 Asset Backed Notes March 2024 [Member] Asset Backed Notes March 2024 Pension Benefits Pension Plan [Member] Common Stock Common Stock [Member] Available for sale (cost: $25,495 at June 30, 2026; $22,994 at December 31, 2025) Investment securities available for sale, estimated fair value Investment securities available for sale, estimated fair value Debt Securities, Available-for-Sale Year five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff August 2024 Asset Backed Notes August 2024 [Member] Asset Backed Notes August 2024 Derivative Contract Derivative Contract [Domain] Net realized gains Debt Securities, Available-for-Sale, Realized Gain (Loss) Total liabilities and shareholders’ equity Liabilities and Equity Collateral (a) Derivative Liability, Not Subject To Master Netting Arrangement, Collateral, Right To Reclaim Cash Offset Derivative Liability, Not Subject To Master Netting Arrangement, Collateral, Right To Reclaim Cash Offset Employee Stock Option Share-Based Payment Arrangement, Option [Member] Servicing Asset at Fair Value, Activity [Table] Servicing Asset at Fair Value, Activity [Table] Segments Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Credit cards Commitments To Extend Credit For Credit Cards Commitments To Extend Credit For Credit Cards Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Investment securities held to maturity Payments to Acquire Held-to-Maturity Securities Name Awards Close in Time to MNPI Disclosures, Individual Name Due after five years through ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 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] Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity [Table Text Block] Amortized cost and estimated fair value of debt securities by contractual maturity. Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Axis] Net Periodic Defined Benefit Cost for Defined Benefit Plans Schedule of Defined Benefit Plans Disclosures [Table Text Block] Real estate and other foreclosed assets acquired in settlement of loans Real Estate Owned, Transfer to Real Estate Owned Preferred stock. dividend rate spread (as a percent) Preferred Stock, Dividend Rate Spread, Percent Preferred Stock, Dividend Rate Spread, Percent Equity securities, gross unrealized losses Equity Securities Gross Unrealized Losses Equity securities gross unrealized losses. Preferred stock Carrying Amount Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Fixed Derivative, Average Fixed Interest Rate Loans And Leases Receivable [Table] Loans And Leases Receivable [Table] Loans and Leases receivable. Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid during the period Interest Paid, Excluding Capitalized Interest, Operating Activity Hedging Designation Hedging Designation [Axis] Credit Facility Credit Facility [Axis] Total assets Assets, Fair Value Disclosure Name Measure Name Pay vs Performance Disclosure [Line Items] All Other Other Operating Segment [Member] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Loans Insured or Guaranteed by Government Authorities [Axis] Loans Insured or Guaranteed by Government Authorities [Axis] Loans Interest and Fee Income, Financing Receivable August 2023 Asset Backed Notes August 2023 [Member] Asset Backed Notes August 2023 Junior subordinated debentures — M&T (a) Junior Subordinated Notes Summary of Current, Past Due and Nonaccrual Loans Loans And Leases Receivable Net Of Deferred Income By Accrual Status [Table Text Block] Loans and leases receivable net of deferred income by accrual status. Additional Paid-in Capital Additional Paid-in Capital [Member] Computations of Basic Earnings Per Common Share Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] Name Trading Arrangement, Individual Name Cash and due from banks Cash and Cash Equivalent Other liabilities Other Liabilities, Fair Value Disclosure Loans Proceeds from Sale of Loans Receivable Gain (loss) on bank investment securities Debt and Equity Securities, Gain (Loss) Company Selected Measure Amount Company Selected Measure Amount Preferred Series F Series F Preferred Stock [Member] Depreciation and amortization of premises and equipment Depreciation and amortization Depreciation, Depletion and Amortization Service charges on deposit accounts Fees and Commissions, Depositor Accounts1 Fees and Commissions, Depositor Accounts1 Net change in accrued interest receivable, payable Net Change In Accrued Interest Receivable Payable Net change in accrued interest receivable, payable. Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Non-PEO NEO Non-PEO NEO [Member] May 2025 Asset Backed Notes May 2025 [Member] Asset Backed Notes May 2025 Noninterest-bearing deposits Noninterest-Bearing Deposit Liabilities, Domestic Total other expense Noninterest Expense Award Timing Method Award Timing Method [Text Block] Other Product and Service, Other [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Amortization of prior service credit and actuarial gains Defined Benefit Plan, Amortization of Gain (Loss) Mortgage-backed securities Debt Securities, Held-to-Maturity, Maturity, without Single Maturity Date, Fair Value Net income Net income Net income (loss) Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Computations of Diluted Earnings Per Common Share Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Asset Backed Notes May 2026 Asset Backed Notes May 2026 [Member] Asset Backed Notes May 2026 Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] Accumulated Other Comprehensive Income (Loss), Net Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Trading Activity Trading Activity [Axis] Trust income Noninterest Income, Trust Income Noninterest Income, Trust Income Capital expenditures, net Payments for (Proceeds from) Productive Assets FRB of New York FRB of New York [Member] FRB of New York. Amount of initial margin posted Collateral Already Posted, Aggregate Fair Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Due after ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Equity and other securities Proceeds From Sale Of Equity And Other Securities Investments Proceeds from sale of equity and other securities investments. Average common shares outstanding Adjusted weighted-average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Statistical Measurement Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Other Commitments To Extend Credit For Commercial And Other Commitments to extend credit for commercial and other. Master Netting Agreements Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Period of satisfaction of contract with customer Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Collateral (a) Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Total deposits Deposits Deposits Common stock, $0.50 par, 250,000,000 shares authorized, 179,436,779 shares issued at June 30, 2026 and December 31, 2025 Common Stock, Value, Issued Commercial letters of credit Commitments Regarding Commercial Letters Of Credit Commitments regarding commercial letters of credit. 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This amount is a reduction in the calculation of weighted average shares outstanding for the earnings per share calculation. Amendment flag Amendment Flag Disposal Group Classification [Axis] Disposal Group Classification [Axis] Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] Investment securities available for sale, gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Forward-Starting Interest Rate Swap Agreements Forward Starting Interest Rate Swap Agreements [Member] Forward starting interest rate swap agreements. Loss Contingencies [Table] Loss Contingencies [Table] Investments Investments [Domain] FHLB Facility Federal Home Loan Bank Advances [Member] Other securities, estimated fair value Federal Home Loan Bank Stock and Federal Reserve Bank Stock Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Amortized Cost Total Financing Receivable, Excluding Accrued Interest, Nonaccrual PEO Total Compensation Amount PEO Total Compensation Amount February 2026 Asset Backed Notes February 2026 [Member] Asset Backed Notes February 2026 Other Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Mortgage-backed securities Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date Notional Amount Derivative, Notional Amount Basic (in shares) Weighted-average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Fair Value By Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Commitments and Contingent Liabilities Outstanding Commitments [Table Text Block] The tabular disclosure of commitments. Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Interest-bearing deposits at banks Interest-Bearing Deposits in Banks and Other Financial Institutions Commitments to extend credit to commercial customers Commitments To Extend Credit To Commercial Customers Commitments to extend credit to commercial customers. Unfunded Loan Commitment Unfunded Loan Commitment [Member] Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Total other income Noninterest income Noninterest Income Derivatives not designated as hedging instruments, derivatives Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net Equity securities, gross unrealized gains Equity Securities Gross Unrealized Gains Equity securities gross unrealized gains. Debt securities available for sale: Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Loans and allowance for loan losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Time deposits Time Deposits Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Dividends paid — preferred Payments of Ordinary Dividends, Preferred Stock and Preference Stock Class of Stock Class of Stock [Axis] Basic Net income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Debt Securities, Held-to-Maturity [Table] Debt Securities, Held-to-Maturity [Table] Other Consumer, Other [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Schedule of Servicing Assets at Fair Value Schedule of Servicing Assets at Fair Value [Table Text Block] Modified past due 30-89 days Delinquency Status of Loans and Leases Receivable Modified Past Due Thirty to Eighty Nine Days Delinquency status of loans and leases receivable modified past due thirty to eighty nine days. Interest Rate Contract For Real Estate Loans Interest Rate Contract For Real Estate Loans [Member] Interest Rate Contract For Real Estate Loans Net loans Net loans Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Treasury stock — common, at cost — 34,507,260 shares at June 30, 2026; 27,604,513 shares at December 31, 2025 Treasury Stock, Value René F. Jones [Member] René F. Jones Pledged financial instruments Financial Instruments, Owned, at Fair Value Trading account and other non-hedging derivative gains Trading Gain (Loss) Long-term borrowings (a) Total long-term borrowings Loan facility carrying amount Long-Term Debt Renewable Energy Renewable Energy [Member] Renewable Energy Total debt securities estimated fair value Investment In Debt Securities Estimated Fair Value Investment in debt securities estimated fair value. Year three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year HTM, Less than 12 months, gross unrealized losses Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Net cash from investing activities Net cash from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Due after five years through ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Shareholders' equity Equity [Text Block] Security Exchange Name Security Exchange Name Transaction Market Method [Axis] Transaction Market Method [Axis] Interest Income Recognized Impaired Financing Receivable Nonaccrual Interest Income Impaired financing receivable nonaccrual interest income. Total liabilities Liabilities, Fair Value Disclosure Net change in short-term borrowings Net Increase Decrease In Short Term Borrowings Net increase (decrease) in short term borrowings. Due after one year through five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Accrued interest and other assets Interest Receivable and Other Assets AFS, 12 months or longer, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Available-for-sale, transfer to held-to-maturity, loss Debt Securities, Available-for-Sale, Transfer to Held-To-Maturity, Loss Debt Securities, Available-for-Sale, Transfer to Held-To-Maturity, Gain Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Asset-backed notes (a) Secured Long-Term Debt, Noncurrent Investment securities in held-to-maturity portfolio securitized by Bayview Financial Debt Security, Mortgage-Backed, Held-to-Maturity, Fair Value Disclosure Commercial and industrial Commitments To Extend Credit For Commercial And Industrial Commitments To Extend Credit For Commercial And Industrial Changes in fair value resulting from changes in assumptions Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions Debt securities held to maturity: Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Weighted-average shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Reclassification from AOCI, current period, net of tax, attributable to parent Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Impact on fair value of 20% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed Defined contribution pension and retirement savings plans total expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Institutional Services and Wealth Management Institutional Services And Wealth Management [Member] Institutional Services And Wealth Management Fair Value Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value Long-term borrowings Interest Expense, Long-Term Debt Due in one year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Net unrealized gains (losses) on investment securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Time deposits Interest Expense, Time Deposits Defined Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Residential Mortgage Loans Residential Mortgage [Member] Debt Securities Debt Securities [Member] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted (in shares) Adjusted weighted-average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Preferred Series L Series L Preferred Stock [Member] Series L Preferred Stock Underlying Security Market Price Change Underlying Security Market Price Change, Percent Savings and interest-checking deposits Interest Expenses Savings And Interest Checking Deposits Interest expenses savings and interest checking deposits. Derivative financial instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Gross unrealized losses for held to maturity Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Short-term borrowings Total short-term borrowings Short-Term Debt Subject to master netting agreements Derivative Liability, Subject to Master Netting Arrangement, before Offset Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Combination of Modification Types Combination of Modification Types [Member] Combination of modification types. Treasury Stock Treasury Stock, Common [Member] Other assets for its "investment" in the common securities recognized by the company of various trusts Other Assets For Its Investment In Common Securities Recognized By Company Of Various Trusts Other assets for its "investment" in the common securities recognized by the company of various trusts. Standby letters of credit Letters of Credit Outstanding, Amount Debt Securities, Available-for-Sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Changes in fair value included in Mortgage banking revenues (a) Servicing Asset at Fair Value, Additions Total investment securities, less than 12 months, fair value Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value This item represents the fair value of securities that have been in a continuous loss position for less than twelve months. Organization, Consolidation and Presentation of Financial Statements [Abstract] Year three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Collateral Held Collateral Held [Domain] Home equity lines and loans (e) Home Equity Lines And Loans [Member] Home equity lines and loans. All Executive Categories All Executive Categories [Member] Investment securities Investment Securities Investment Securities Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Total debt securities gross unrealized gains Investment In Debt Securities Gross Unrealized Gains Investment in debt securities gross unrealized gains. Time deposits Time Deposits, Fair Value Disclosure Time Deposits, Fair Value Disclosure Outside data processing and software Information Technology and Data Processing Net Amount Derivative Liability, Not Subject to Master Netting Arrangement, After Offset Derivative Liability, Not Subject to Master Netting Arrangement, After Offset Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment information Segment Reporting [Text Block] Investment securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Mortgage banking revenues Noninterest Income, Mortgage Banking Noninterest Income, Mortgage Banking Minimum Minimum [Member] Investment Type Investment Type [Axis] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] HTM, less than 12 months, fair value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Total Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Preferred Series J Series J Preferred Stock [Member] Series J Preferred Stock Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance Disaggregation of Revenue [Table Text Block] Liabilities Liabilities [Abstract] Income Statement Location Location, Statement of Income, Balance [Axis] Investments amortized to income tax expense Investment Program, Proportional Amortization Method, Applied, Amortization Expense Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Automobile loans Automobile Loans [Member] Automobile Loans Accrued interest and other liabilities Other Liabilities Net Amount Derivative Asset, Not Subject To Master Netting Arrangement, After Offset Derivative Asset, Not Subject To Master Netting Arrangement, After Offset Net periodic benefit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other revenues from operations Noninterest Income, Other Operating Income Schedule Of Financing Receivable Allowance For Credit Losses [Table] Financing Receivable, Allowance for Credit Loss [Table] Common stock authorized (in shares) Common Stock, Shares Authorized Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Total investment securities, less than 12 months, gross unrealized losses Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses Amount of accumulated unrealized loss on investments in debt and equity securities that have been in a continuous loss position for less than twelve months. Gross realized gains Debt Securities, Available-for-Sale, Realized Gain Schedule of Held-to-Maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] State and political subdivisions US States and Political Subdivisions Debt Securities [Member] Lender Name [Axis] Lender Name [Axis] Year four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Investment securities available for sale Proceeds from Sale of Debt Securities, Available-for-Sale Preferred Series E Series E Preferred Stock [Member] Payments on long-term borrowings Repayments of Long-Term Debt Preferred stock, liquidation preference per share (in USD per share) Preferred Stock, Liquidation Preference Per Share Preferred Series I Series I Preferred Stocks [Member] Series I preferred stocks Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investments Equity Method Investments Equity Component Equity Component [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Loans measured at fair value on nonrecurring basis Loans Receivable, Fair Value Disclosure Adoption Date Trading Arrangement Adoption Date Financial guarantees and indemnification contracts Commitments Regarding Financial Guarantees And Indemnification Contracts Commitments regarding financial guarantees and indemnification contracts. Counterparty Name [Domain] Counterparty Name [Domain] Equity securities Equity Securities, FV-NI, Current Bayview Lending Group Bayview Lending Group [Member] Bayview Lending Group. Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Weighted-Average Maturity (In years) Derivative, Average Remaining Maturity Investment securities, held to maturity, fair value Estimated fair value for held to maturity Debt Securities, Held-to-Maturity, Fair Value Other, net Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Short-term borrowings Interest Expense, Short-Term Borrowings Commercial and industrial Commercial Portfolio Segment [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Schedule of Error Corrections and Prior Period Adjustments Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Bayview Lending Group and Bayview Financial Bayview Lending Group And Bayview Financial [Member] Bayview Lending Group and Bayview Financial. Nonaccrual Nonaccrual [Member] Nonaccrual Commitments and contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Additions Servicing Asset At Fair Value, Changes In Fair Value Servicing Asset At Fair Value, Changes In Fair Value All Adjustments to Compensation All Adjustments to Compensation [Member] Net cash from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Residential real estate Residential Portfolio Segment [Member] Pledging Purpose [Domain] Pledging Purpose [Domain] Net change in loans originated for sale Increase (Decrease) in Loan, Held-for-Sale Income Statement [Abstract] Income Statement [Abstract] Shareholders' equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Estimated fair value gain (loss) Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments Other Commitments [Domain] Other Commitments [Domain] City Area Code City Area Code Prior Service Credit Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Document Information [Table] Document Information [Table] Home equity lines of credit Commitments To Extend Credit For Home Equity Lines Of Credit Commitments to extend credit for home equity lines of credit. Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Defined benefit plan, net periodic benefit cost (credit) excluding service cost, statement of income or comprehensive income [extensible enumeration] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment securities pledged to secure debt carrying value Carrying Value Of Investment Securities Pledged Carrying value of investment securities pledged. Entity [Domain] Entity [Domain] Impact of estimated fair value gain (losses) on hedging instruments Impact In Estimated Fair Value Gain Losses On Hedging Instruments Impact in estimated fair value gain (losses ) on hedging instruments. Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Residential Residential Real Estate Excluding Alt A [Member] Residential real estate excluding Alt-A. Total interest income Interest and Dividend Income, Operating Schedule Of Financing Receivable Recorded Investment Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables Modifications to borrowers experiencing financial difficulty on financing receivables [Table Text Block] Modifications to borrowers experiencing financial difficulty on financing receivables. Amortization of capitalized servicing rights Amortization of Mortgage Servicing Rights (MSRs) Net change in deposits Increase (Decrease) in Deposits Master Netting Agreements Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Total investment securities Investment securities held to maturity Investments Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Domain] Subsequent Event Type [Domain] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income Components Of Other Comprehensive Income Loss [Table Text Block] The tabular disclosure of components of other comprehensive income loss. Revolving Loans Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Investment Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Provision for credit losses Financing Receivable And Unfunded Commitments, Excluding Accrued Interest, Credit Loss Expense (Reversal) Financing Receivable And Unfunded Commitments, Excluding Accrued Interest, Credit Loss Expense (Reversal) Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves Changes in fair value recognized for the three months ended Increase Decrease In Fair Value Of Nonrecurring Fair Value Measured Loans For Charge Offs And Impairment Reserves Increase (decrease) in fair value of nonrecurring fair value measured loans for charge offs and impairment reserve. Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Summary of loans in Accrual and Nonaccrual Status Summary Of Loans In Accrual And Nonaccrual Status [Table Text Block] Summary of loans in accrual and nonaccrual status. Total Shareholder Return Amount Total Shareholder Return Amount Foreign exchange and other option and futures contracts Foreign Exchange And Other Option And Futures Contracts [Member] Foreign exchange and other option and futures contracts. Cash flow hedges: Cash Flow Hedging [Member] Fixed Rate Long-Term Borrowings Fixed Rate Long Term Borrowings [Member] Fixed rate long-term borrowings. Adjustments to reconcile net income to net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Other commercial real estate Commitments To Extend Credit For Other Commercial Real Estate Commitments to extend credit for other commercial real estate. Other Accumulated Other [Member] Accumulated other. HTM, 12 months or longer, gross unrealized losses Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Premises and equipment Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Other Other Interest and Dividend Income Interest cost on benefit obligation Defined Benefit Plan, Interest Cost Financial Instruments Financial Instruments [Domain] Year five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Fair Value Amount in Consolidated Balance Sheet Derivative Asset Amortized Cost and Estimated Fair Value of Investment Securities Amortized Cost And Estimated Fair Value Of Investment Securities [Table Text Block] Amortized cost and estimated fair value of investment securities. Net income available to common shareholders Income available to common shareholders: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Underlying Securities Award Underlying Securities Amount Estimated Fair Value Estimate of Fair Value Measurement [Member] Revenue from contracts with customers Revenue from Contract with Customer [Text Block] Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Preferred Stock Preferred Stock [Member] Other, net Payment for (Proceeds from) Other Investing Activity Schedule Of Segment Reporting Information By Segment [Table] Segment Reporting [Table] Modified in period Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Relationship with BLG and Bayview Financial Relationship With Other Entities [Text Block] Relationship with other entities. Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] AFS, less than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Not subject to master netting agreements (c) Derivative Liability, Not Subject to Master Netting Arrangement Gain on disposition of business Gain (Loss) on Disposition of Business Held to maturity (fair value: $11,119 at June 30, 2026; $11,715 at December 31, 2025) Amortized cost for held to maturity Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Provision for credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Derivative [Line Items] Derivative [Line Items] Weighted-average remaining term Loans and leases weighted-average remaining term Loans and leases weighted-average remaining term Unfunded commitments includes carrying amount of its investments Unfunded Commitments Includes Carrying Amount Of Its Investments Unfunded commitments includes carrying amount of its investments. Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common stock per share dividend amount (in USD per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Cash flow hedge reclassification before tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Senior notes Senior Notes Preferred stock per share dividend amount (in USD per share) Preferred Stock, Dividends Per Share, Declared Measure: Measure [Axis] Divestiture Equity Method Investments and Joint Ventures Disclosure [Text Block] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Treasury stock (in shares) Treasury Stock, Common, Shares Net change in trading account and other non-hedging derivative assets and liabilities Increase (Decrease) in Financial Instruments Used in Operating Activities Equity Components Equity Components [Axis] Change in cash flow hedges derivative instruments, fair value net Change in Cash Flow Hedges Derivative Instruments At Fair Value Net Change in Cash Flow Hedges Derivative Instruments At Fair Value Net Income taxes paid during the period Income Tax Paid, after Refund Received Entity Interactive Data Current Entity Interactive Data Current Impact on fair value of 10% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Entity Small Business Entity Small Business Total comprehensive income Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Net interest income Net Interest Income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Document Type Document Type Due after ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 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] M&T M And T [Member] M&T. Significant accounting policies Significant Accounting Policies [Text Block] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Proceeds from long-term borrowings Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Other Postretirement Benefits Other Postretirement Benefits Plan [Member] Total other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Pledged Status [Domain] Pledged Status [Domain] Income before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Debt Instrument, Redemption, Period Debt Instrument, Redemption, Period [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Trust income Fiduciary and Trust [Member] Wilmington Trust SP Services Inc. Wilmington Trust SP Services Inc. [Member] Wilmington Trust SP Services Inc. Executive Category: Executive Category [Axis] Other securities, amortized cost Other Investments and Securities, at Cost Counterparty Name [Axis] Counterparty Name [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Variable Interest Entity [Table] Variable Interest Entity [Table] Readily marketable securities gross unrealized losses Readily Marketable Securities At Fair Value Gross Unrealized Losses Readily marketable securities at fair value gross unrealized losses. Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Reserve for Unfunded Credit Commitments Reserve for Unfunded Credit Commitments [Member] Reserve for Unfunded Credit Commitments PEO Name PEO Name Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] HTM, 12 months or longer, fair value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed Percentage Of Loans In The Process Of Foreclosure Serviced By Other Entities Classified As Government Guaranteed Percentage of loans in the process of foreclosure, serviced by other entities, classified as government guaranteed. Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Cash and due from banks Cash and Due from Banks Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Current Financial Asset, Not Past Due [Member] Commitments to extend credit Commitments To Extend Credit, Amount Commitments To Extend Credit, Amount Less: Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Net Amount Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 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] Average total assets Assets, Average Outstanding Debt Instrument [Axis] Debt Instrument [Axis] Interest expense Interest Expense, Operating and Nonoperating [Abstract] Salaries and employee benefits Labor and Related Expense Net change in loans Payments for (Proceeds from) Loans and Leases Disposal Group Name [Axis] Disposal Group Name [Axis] Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program Maximum Credit Risk For Recourse Associated With Loans Sold Under Federal National Mortgage Association Delegated Underwriting And Servicing Program Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program. Investment securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic (in USD per share) Basic earnings per common share (in USD per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] Readily marketable securities amortized cost Readily Marketable Securities At Fair Value Amortized Cost Readily marketable securities at fair value amortized cost. 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] Asset Pledged as Collateral without Right Asset Pledged as Collateral without Right [Member] Fair Value Measurement Fair Value Measurement [Domain] Clearinghouse Credit Facilities Clearinghouse Credit Facilities [Member] Clearinghouse credit facilities. Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Total investment securities, 12 months or longer, gross unrealized losses Investment Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses Amount of accumulated unrealized loss on investments in debt and equity securities that have been in a continuous loss position for twelve months or longer. Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Equity Awards Adjustments Equity Awards Adjustments [Member] Schedule Of Borrowings [Line Items] Schedule Of Borrowings [Line Items] Schedule of borrowings. Hedging Relationship Hedging Relationship [Domain] Commercial and industrial Commercial Financial Leasing [Member] Commercial financial leasing. Prepayment Rate Measurement Input, Prepayment Rate [Member] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Affordable Housing Projects Affordable Housing Projects [Member] Affordable Housing Projects Revolving Loans Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Pass Pass [Member] Criticized nonaccrual Criticized Nonaccrual [Member] Criticized nonaccrual. Other Other Long-Term Debt Other Other Debt Obligations [Member] Outstanding principal balances of residential mortgage loans from Bayview Financial Sub Serviced Residential Mortgage Loans Of Privately Held Company Outstanding principal balance of sub-serviced residential real estate loans for a privately-held specialty mortgage finance company. Unrealized losses on individual debt securities Debt Securities, Unrealized Gain (Loss) Net gain on sales of assets Gain (Loss) on Disposition of Assets for Financial Service Operations Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Commercial Commercial Commercial Mortgage-Backed Securities [Member] Commitments to sell real estate loans Commitments To Sell Real Estate Loans Notional Amount Commitments to sell real estate loans notional amount. Hedging Designation Hedging Designation [Domain] Class of Stock Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Outstanding balance Other Commitment Schedule of Preferred Stock Schedule of Stock by Class [Table Text Block] 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 Contingent commitments to provide additional capital contributions to partnerships Contingent Commitments to Provide Additional Capital Contributions to Partnerships Contingent Commitments to Provide Additional Capital Contributions to Partnerships Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Federal tax credits and other federal tax benefits recognized Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Retirement Plan Type Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Revision of Prior Period [Axis] Revision of Prior Period [Axis] Offsetting Liabilities Offsetting Liabilities [Table Text Block] Taxable-equivalent adjustment Taxable Equivalent Adjustment Taxable equivalent adjustment. Automobile Automobile Loan [Member] Impact on fair value of 20% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Other Assumption Total available for held to maturity (amortized cost) Held To Maturity Securities Debt Maturities With Single Maturity Date Net Carrying Amount Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, that have single maturity date. Advances from FHLB Federal Home Loan Bank, Advance, Maturity, Year One Readily marketable securities estimated fair value Readily Marketable Securities At Estimated Fair Value Readily marketable securities at estimated fair value. Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Amortized Cost with Allowance Financing Receivable, Excluding Accrued Interest, Nonaccrual, With Allowance Financing Receivable, Excluding Accrued Interest, Nonaccrual, With Allowance Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Long-term borrowings Long-Term Debt, Excluding Current Maturities [Abstract] Redemption of Series G preferred stock Payments for Repurchase of Redeemable Preferred Stock Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Fair Value Amount in Consolidated Balance Sheet Derivative Liability Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] Financing receivable, modifications other than troubled debt restructuring. Entity Address, Address Line One Entity Address, Address Line One Additions to right-of-use assets under operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Less: Income attributable to unvested stock-based compensation awards Income Attributable To Unvested Stock Based Compensation Awards Diluted Income attributable to unvested stock based compensation awards. This amount is used as a reduction to net income available to common equity in the calculation of net income available to common shareholders as used in the determination of diluted earnings per share. Income taxes Income tax expense (benefit) Income Tax Expense (Benefit) Preferred Series H Series H Preferred Stock [Member] Fair value hedges: Fair Value Hedging [Member] Derivative liabilities Offsetting Derivative Liabilities [Abstract] Total Total Charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Schedule Of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Variable Interest Entity Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Loan Restructuring Modification Loan Restructuring Modification [Domain] Statement [Table] Statement [Table] Net income available to common equity Net Income Loss Available To Common Stockholders Basic Before Unvested Stock Based Compensation Awards Adjustment Net income loss available to common stockholders before unvested stock based compensation awards adjustment as used in the determination of basic earnings per common share. Deposits at banks Interest Income, Domestic Deposits Year two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Subject to master netting agreements Derivative Asset, Subject to Master Netting Arrangement, before Offset Impact on fair value of 10% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Other Assumption Real estate loans held for sale Loan, Held-for-Sale, Fair Value Disclosure Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Carrying value of investment securities pledged related to repurchase transactions Carrying Value of Investment Securities Pledged Related to Repurchase Transactions Carrying value of investment securities pledged related to repurchase transactions.. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]