Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Subordinated debt, net of issuance costs of $895 and $972, respectively Subordinated debt, net of deferred issuance costs Subordinated notes, net Subordinated Debt Loans held for sale Financing Receivable, Held-for-Sale Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Carrying Amount Reported Value Measurement [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Net recoveries (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] Nonaccrual with No Allowance for Credit Losses Financing Receivable, Nonaccrual, No Allowance Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS Retirement Benefits [Text Block] LEASES Lessee, Finance Leases [Text Block] 2027 Finance Lease, Liability, to be Paid, Year One Redemption of FHLBNY and FRBNY stock Proceeds from Sale of Federal Reserve Bank Stock Restricted stock awards APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition Term Loans Amortized Cost by Origination Year Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] Amortization of unrecognized transition obligation Defined Benefit Plan, Amortization of Transition Asset (Obligation) Measurement Frequency [Axis] Measurement Frequency [Axis] (Increase) in loans, net Payments for (Proceeds from) Loans Receivable Accrued interest Financing Receivable, Accrued Interest, before Allowance for Credit Loss Proceeds from sales of fixed assets Proceeds from Sale of Productive Assets Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Payments on operating leases Payments on Operating Leases, Operating Activities Payments on Operating Leases, Operating Activities Doubtful Doubtful [Member] Contractual maturity of securities held to maturity Debt Securities, Held-to-Maturity, Maturity [Abstract] Leases [Abstract] Leases [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Interest Rate Reduction Contractual Interest Rate Reduction [Member] Non-owner occupied commercial real estate Non-Owner Occupied [Member] Non-Owner Occupied Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Non-owner occupied commercial real estate Non-Owner Occupied Commercial Real Estate [Member] Non-Owner Occupied Commercial Real Estate Schedule of Amortized Cost and Estimated Fair Value of Securities Held to Maturity Debt Securities, Held-to-Maturity [Table Text Block] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff 2030 and thereafter Lessee, Operating Lease, Liability, to be Paid, Year Five and After Lessee, Operating Lease, Liability, to be Paid, Year Five and After Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Proceeds from sale of other real estate owned Proceeds from Sale of Other Real Estate Unrealized Losses 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 Amortized cost and estimated fair value of debt securities available-for-sale, by expected maturity Available-for-Sale Securities, Debt Maturities [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Not rated Not Rated [Member] A category of financing receivables that are not rated as pass, special mention, substandard, doubtful. Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Operating lease right-of-use assets Operating Lease, Right-Of-Use Asset, Gross Operating Lease, Right-Of-Use Asset, Gross Nonvested, beginning balance (in shares) Nonvested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number FHLBNY overnight advances FHLBNY Overnight Advances [Member] FHLBNY Overnight Advances Total gross charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Amortization of premiums on securities, net Accretion (Amortization) of Discounts and Premiums, Investments Schedule of Corporation's Borrowed Funds Outstanding Federal Home Loan Bank, Advance, Branch of FHLBank [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Construction Construction Construction Loans [Member] Other Products And Services, Other [Member] Products And Services, Other [Member] Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Individually analyzed Financing Receivable, Allowance for Credit Loss, Individually Evaluated Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Entity Address, City or Town Entity Address, City or Town Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 2026 Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Direct consumer loans Direct consumer Direct Consumer Loans [Member] Class of financing receivables related to consumer loans obtained by a consumer directly. Significant Other Observable Inputs (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] Greater Than 89 Days Past Due 90 Days or More Past Due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Other non-interest expenses Other Expenses Held to maturity, fair value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Name of Property [Axis] Name of Property [Axis] Furniture and equipment Furniture and equipment expense Equipment Expense Schedule of Summarized Financial Information Showing Reconciliation of Segment Net Income Loss and Assets to Consolidated Results Segment Reporting [Table Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Revenue Revenue from Contract with Customer [Policy Text Block] Total other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Tax effect Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] After one, but within five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Schedule of Undiscounted Cash Flows of the Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Supplemental disclosure of non-cash activity: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Allowance for credit losses Beginning balance Ending balance Total ending allowance balance Related Allowance Allowance for credit losses Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Document Period End Date Document Period End Date Interest rate on fixed-rate commitments to make loans Interest Rate on Fixed-Rate Commitments to Make Loans Refer to interest rate on the fixed-rate commitments to make loans. Aggregate principal amount Debt Instrument, Face Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Revolving Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Pre - tax loss Gross realized (losses) Debt Securities, Available-for-Sale, Realized Loss Treasury stock, at cost; $488,444 shares at September 30, 2026 and $519,079 shares at December 31, 2025 Treasury Stock, Common, Value Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Finance lease, weighted average remaining lease term (years) Finance Lease, Weighted Average Remaining Lease Term Total fair value of shares vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] EARNINGS PER COMMON SHARE Earnings Per Share [Text Block] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Equity investments, at fair value Debt Securities, Trading, and Equity Securities, FV-NI Total liabilities Liabilities Trading Symbol Trading Symbol Weighted-average interest rate reduction (%) Financing Receivable, Modified, Weighted-Average Interest Rate Decrease from Modification Discount rate Measurement Input, Discount Rate [Member] Securities available for sale, at estimated fair value (amortized cost of $311,879, at September 30, 2026 and $327,888 at December 31, 2025, net of allowance for credit losses of $0 at September 30, 2026 and December 31, 2025, respectively) Total Total Debt Securities, Available-for-Sale, Excluding Accrued Interest Restructured Debt Restructured Debt [Member] Restructured Debt Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Company Selected Measure Name Company Selected Measure Name Included in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Purchases of securities available for sale Payments to Acquire Debt Securities, Available-for-Sale Interest rate on fixed-rate commitments to make commercial draw notes Interest Rate on Fixed-Rate Commitments to Make Commercial Draw Notes Refer to interest rate on fixed-rate commitments to make commercial draw notes. Deposits Interest Expense, Deposits After one, but within five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Schedule of Leased Branch Properties Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] 2026 Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Nonaccrual Financing Receivable, Nonaccrual Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] 2028 Finance Lease, Liability, to be Paid, Year Two Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Credit Loss [Abstract] 2030 Finance Lease, Liability, to be Paid, Year Four Home equity lines and loans Home equity lines and loans Home Equity Lines And Loans [Member] Home Equity Lines And Loans Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Modified [Line Items] Commitments to make loans Commitments to Extend Credit [Member] FHLBNY and FRBNY stock Federal Home Loan Bank And Federal Reserve Bank Stock At Cost Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock represents an equity interest in in a FHLB. They do not have a readily determinable fair values because ownership is restricted and it lacks a market (liquidity). Less: amount representing interest Finance Lease, Liability, Undiscounted Excess Amount Without single maturity date Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Award Timing Predetermined Award Timing Predetermined [Flag] Allowance for credit losses Financing Receivable Allowance For Credit Losses evaluated for impairment [Abstract] Net (losses) on securities transactions Debt Securities, Gain (Loss) Interest and dividend income: Interest and Dividend Income, Operating [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Proceeds from sales, maturities and principal collected on securities held to maturity Proceeds from Sale and Maturity of Held-to-Maturity Securities Commercial Credit Card Commercial Credit Card [Member] Commercial Credit Card Income approach Valuation, Income Approach [Member] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Mortgage-backed securities, residential Residential Mortgage-Backed Securities [Member] Federal Home Loan Bank, Advance, Branch of FHLBank [Table] Federal Home Loan Bank, Advance, Branch of FHLBank [Table] Depreciation and amortization of fixed assets Depreciation expense Depreciation Plan Name [Domain] Plan Name [Domain] (Less) participating securities (in shares) Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights Available for sale, amortized cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Operating lease right-of-use assets Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Within one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] SECURITIES Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Cash dividends paid Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Unrecognized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Repossessed vehicles Repossessed Vehicles [Member] Repossessed Vehicles Subordinated notes, net Subordinated Debt [Member] Variable Rate Variable Interest Rate [Member] Financial instruments or contractual agreements with a variable interest rate. Tax effect Other Comprehensive Income (Loss), Available-for-Sale Securities, Tax, Portion Attributable to Parent Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Interest-bearing Interest-Bearing Deposit Liabilities Segments [Domain] Segments [Domain] Advances were collateralized Financing Receivable, after Allowance for Credit Loss Net of issuance cost Debt Issuance Costs, Net PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Finance lease, weighted average discount rate Finance Lease, Weighted Average Discount Rate, Percent Fixed rate Debt Instrument, Interest Rate, Stated Percentage Cash dividends declared Dividends, Common Stock, Cash Total shareholders' equity Beginning balance Ending balance Equity, Attributable to Parent ASSETS Assets [Abstract] Payment Delay Payment Deferral [Member] Schedule of Risk Category of the Recorded Investment of Loans by Class of Loans Financing Receivable Credit Quality Indicators [Table Text Block] (Decrease) in FHLBNY overnight advances, net Net Change in FHLBNY Advances Net Change in FHLBNY Advances Non-recurring Fair Value, Nonrecurring [Member] Professional services Professional Fees Insider Trading Policies and Procedures [Line Items] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Number of primary business segments Number of Operating Segments Schedule of Changes in Goodwill Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Additional paid-in capital Additional Paid in Capital, Common Stock 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] Expense related to restricted stock units for directors' deferred compensation plan Restricted Stock Expense Directors Deferred Compensation Plan The noncash expense that represents the cost of restricted stock distributed to Directors as compensation. Distribution of shares of treasury stock for for directors' compensation (in shares) Distribution Of Shares Of Treasury Stock For Directors Compensation Shares Number of treasury shares issued during the period for directors' compensation. Loan expense Loan Portfolio Expense, Net Loan Portfolio Expense, Net Pledging Purpose [Axis] Pledging Purpose [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Net gains (losses) on sales of OREO Sale of OREO [Member] Sale of OREO [Member] Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Modified [Table] Basis rate Debt Instrument, Basis Spread on Variable Rate Restricted Stock Restricted Stock [Member] Total minimum lease payments Finance Lease, Liability, to be Paid Loans originated and held for sale Payment for Origination and Purchase, Loan, Held-for-Sale Accumulated Other Comprehensive Income (Loss) Total AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Weighted-average period for recognition (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Full redemption Debt Instrument, Full Redemption Debt Instrument, Full Redemption Net gains on sales of loans Sale of Loans [Member] Sale of Loans [Member] Statement [Line Items] Statement [Line Items] Total assets Assets Assets 2025 Plan 2025 Plan [Member] 2025 Plan Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Term Extension Extended Maturity [Member] Total interest expense Interest expense Interest Expense, Operating Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Industry Sector [Axis] Industry Sector [Axis] Operating Segments Operating Segments [Member] Reclassification adjustment for losses realized in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax STOCK COMPENSATION Share-Based Payment Arrangement [Text Block] Without single maturity date Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Other comprehensive income before reclassification OCI, before Reclassifications, Net of Tax, Attributable to Parent Net occupancy Net occupancy expense Occupancy, Net PEO PEO [Member] Non interest-bearing Noninterest-Bearing Deposit Liabilities Total borrowed funds Debt, Long-Term and Short-Term, Combined Amount LOANS AND ALLOWANCE FOR CREDIT LOSSES Credit Loss, Financial Instrument [Text Block] Loans And Unfunded Commitments Loans And Unfunded Commitments [Member] Loans And Unfunded Commitments Goodwill Beginning of year Ending balance Goodwill Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Tax expense (benefit) Debt Securities, Available-for-Sale, Tax Expense (Benefit) Debt Securities, Available-for-Sale, Tax Expense (Benefit) Corporate bonds and notes Corporate bonds and notes, fair value disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents corporate bonds and notes as of the balance sheet date which have been categorized as available-for-sale. Changes in fair value of equity investments Change in fair value of equity investments, net Equity Securities, FV-NI, Gain (Loss) Retained Earnings Retained Earnings [Member] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Actuarial losses Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Increase (Decrease) in Shareholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Schedule of Carrying Value and Estimated Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Corporate bonds and notes Corporate Debt Securities [Member] Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Other real estate owned: Other Real Estate Owned [Member] Refers to the Other real estate owned member. Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] FDIC insurance Federal Deposit Insurance Corporation Premium Expense Provision (credit) for credit losses Provision for credit losses Financing Receivable, Credit Loss, Expense (Reversal) Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense 2023 Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Revenues from contracts with customer Revenue from Contract with Customer, Excluding Assessed Tax Loan Status [Axis] Loan Status [Axis] Loan Status Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Commercial Real Estate and Residential Real Estate Commercial Real Estate and Residential Real Estate [Member] Commercial Real Estate and Residential Real Estate Increase (decrease) in accrued interest payable Increase (Decrease) in Interest Payable, Net Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Arrangement with Individual, Share-Based Payments [Line Items] CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Losses (gains) on interest rate swaps, net Derivative, Gain (Loss) on Derivative, Net Schedule of Future Minimum Financial Lease Payments Finance Lease, Liability, to be Paid, Maturity [Table Text Block] 2026 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Collateral [Axis] Collateral Held [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost, benefits earned during the period Defined Benefit Plan, Service Cost Revolving Loans Amortized Cost Financing Receivable, Excluding Accrued Interest, Revolving Financial asset, measurement input Financial Asset, Measurement Input Financial Asset, Measurement Input % of Loan Class Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Schedules of Allowance for Credit Loss Financing Receivable, Allowance for Credit Loss [Table Text Block] Common stock, shares issued (in shares) Common Stock, Shares, Issued Beginning balance Ending balance Corporate bonds and notes Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Within one year Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Losses on sales of other real estate owned, net Gains (Losses) On Sales Of Other Real Estate Net Gains (Losses) On Sales Of Other Real Estate Net Interest Rate Type [Domain] Interest Rate Type [Domain] Interest Rate Type [Domain] Number of corporate bonds transferred out of Level 2 into Level 3 Number of Corporate Debt Investments Transferred Out Of Level 2 Into Level 3 Number of Corporate Debt Investments Transferred Out Of Level 2 Into Level 3 12 months or longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss) Note [Text Block] BORROWED FUNDS Federal Home Loan Bank Advances, Disclosure [Text Block] Product and Service [Domain] Product and Service [Domain] Eligible borrow (up to) Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds After one, but within five years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Net gains (losses) on sales of other real estate owned Gains (Losses) on Sales of Other Real Estate Combination Combination [Member] Combination Non-interest expense: Noninterest Expense [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Marketing and advertising Marketing and Advertising Expense 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Net of tax amount Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Fair Value as of Grant Date Award Grant Date Fair Value Collateral Pledged Collateral Pledged [Member] Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Corporate Subordinated Debt Corporate Subordinated Debt [Member] Corporate Subordinated Debt Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Interchange revenue from debit card transactions Interchange revenue from debit card transactions Interchange Revenue [Member] Interchange Revenue [Member] Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Principal Reduction Financing Receivable, Excluding Accrued Interest, Modified, Accumulated Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Loan Status [Domain] Loan Status [Domain] Loan Status [Domain] Salaries and wages Salaries And Incentive Compensation Expenditures for salaries, incentive and share based compensation. Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Organization Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Collateralized mortgage obligations Collateralized Mortgage Obligations [Member] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Available for sale, estimated fair value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year FAIR VALUE Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Withholding of shares of common stock (in shares) Treasury Stock, Shares, Acquired Schedule of Analysis of Collateral Dependent Loans Schedule Of Analysis Of Collateral Dependent Loans [Table Text Block] Schedule Of Analysis Of Collateral Dependent Loans Other components of net periodic pension and postretirement benefits Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Debt securities, held-to-maturity, allowance for credit loss Estimated Fair Value Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Equity investments, at estimated fair value Equity Securities, FV-NI and without Readily Determinable Fair Value Commitments period to make real estate and home equity loans (days) Commitments period to make Real Estate and Home Equity loans Represents the period, for which commitments are generally made to make real estate and home equity loans. 30 - 59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Interest expense Interest Expense, Debt WMG fee income WMG Wealth Management Group Services Segment [Member] A segment of the Company that provides revenues by providing trust and investment advisory services to clients. Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Withholding of shares of common stock Treasury Stock, Value, Acquired, Cost Method Non-interest income: Noninterest Income [Abstract] Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Sale of shares of treasury stock Stock Issued During Period, Value, Treasury Stock Reissued Weighted-average term extension (in months) Financing Receivable, Excluding Accrued Interest, Modified in Period, Term Extension Financing Receivable, Excluding Accrued Interest, Modified in Period, Term Extension Schedule of Reclassification Out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Non-NEOs Non-NEOs [Member] (Decrease) in time deposits Increase (Decrease) in Time Deposits CFS fee and commission income Investment Brokerage [Member] Investment Brokerage [Member] Fair Value Debt Securities, Held-to-Maturity, Fair Value, Maturity [Abstract] LEASES Lessee, Operating Leases [Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] After five, but within ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Purchase of treasury stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] 2 Rush Street, Schenectady, New York Branch Location, 2 Rush Street, Schenectady, New York [Member] Branch Location, 2 Rush Street, Schenectady, New York Distribution of shares of treasury stock grants for employee restricted stock awards (in shares) Distribution Of Treasury Stock For Employee Restricted Stock Awards, Shares Distribution Of Treasury Stock For Employee Restricted Stock Awards, Shares Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Debt securities available for sale, amortized cost Total Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Retained earnings Retained Earnings (Accumulated Deficit) Income from bank-owned life insurance Income from bank-owned life insurance [Member] Income from bank-owned life insurance Consumer Loans Consumer Loans Consumer Portfolio Segment [Member] Product and Service [Axis] Product and Service [Axis] Equity investments Equity Securities, FV-NI Indirect consumer loans Indirect consumer Indirect Consumer Loans [Member] Class of financing receivables related to consumer loans obtained by a third party originator. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Qualified Pension Plan Pension Plan [Member] Common Stock Common Stock [Member] Total available for sale securities Securities available for sale Debt Securities, Available-for-Sale Schedule Of Fair Value Off Balance Sheet Risks [Table] Fair Value, off-Balance-Sheet Risk [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] 2022 Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Maturity period of fixed-rate commitments to make loans (years) Maturity Period of Fixed-Rate Commitments to Make Loans Refers to maturity period of the fixed-rate commitments to make loans. Commercial and Industrial Commercial and industrial Commercial and Agricultural Portfolio Segment [Member] Portfolio segment of the company's total financing receivables related to commercial and agricultural receivables. WMG fee income WMG Fee Income [Member] WMG Fee Income Total Past Due Financial Asset, Past Due [Member] Total liabilities and shareholders' equity Liabilities and Equity Purchases of FHLBNY and FRBNY stock Payments to Acquire Federal Reserve Bank Stock Employee Stock Option Share-Based Payment Arrangement, Option [Member] Supplemental Pension Plan Supplemental Employee Retirement Plan [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Overdraft fees Overdraft Fees [Member] Overdraft Fees [Member] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Purchases of securities held to maturity Payments to Acquire Held-to-Maturity Securities Name Awards Close in Time to MNPI Disclosures, Individual Name Fixed rate advance FHLBNY Term Advances Two [Member] FHLBNY Term Advances Two 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] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Transfer of loans to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Overnight and short-term advances FHLBNY advances Federal Home Loan Bank, Advance, Branch of FHLBank, Amount 60 - 89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Proceeds from sales of securities available for sale, gross Proceeds from Sale of Debt Securities, Available-for-Sale, Gross Proceeds from Sale of Debt Securities, Available-for-Sale, Gross Commercial Real Estate And Business Assets Commercial Real Estate And Business Assets [Member] Commercial Real Estate And Business Assets Assets, fair value disclosure Assets, Fair Value Disclosure Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Contractual amounts of financial instruments with off-balance sheet risk Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability Loans, including fees Interest and Fee Income, Financing Receivable Additional Paid-in Capital Additional Paid-in Capital [Member] Schedule of Contractual Amounts of Financial Instruments with Off-Balance Sheet Risk Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Goodwill impairment charges Goodwill, Impairment Loss Forfeitures of shares of restricted stock awards Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Revenue not from contact with customer Revenue Not from Contract with Customer Name Trading Arrangement, Individual Name Total unrecognized compensation cost related to nonvested shares granted under the Plan Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Total cash and cash equivalents Cash and Cash Equivalent Operating lease, rent expense Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Unused lines of credit Unused lines of Credit [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Collectively analyzed Financing Receivable, Allowance for Credit Loss, Collectively Evaluated Operating lease, weighted average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Advance from Federal Home Loan Bank [Abstract] Total non-interest expense Noninterest Expense Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Deferred Compensation Arrangement with Individual, Share-Based Payment [Table] Forfeitures of shares of restricted stock awards (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Award Timing Method Award Timing Method [Text Block] Increase in cash and cash equivalents, net Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Amortization of unrecognized net loss Defined Benefit Plan, Amortization of Gain (Loss) Without single maturity date Debt Securities, Held-to-Maturity, Maturity, without Single Maturity Date, Fair Value Net income Net income Net income Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Financing Receivable Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Distribution of shares of treasury stock for directors' compensation Distribution Of Shares Of Treasury Stock For Directors Compensation Value Value of treasury stock issued during the period for directors' compensation. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] After ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Statistical Measurement [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Total deposits Deposits Common stock, $0.01 par value per share, 10,000,000 shares authorized; 5,310,076 issued at September 30, 2026 and December 31, 2025 Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Restricted Stock Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Restatement Determination Date Restatement Determination Date Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Other Other Noninterest Expense (Less) allocation of earnings & dividends to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Amendment Flag Amendment Flag Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Standby letters of credit Standby Letters of Credit [Member] Buildings Finance Lease, Right-of-Use Asset, before Accumulated Amortization Schedule of Amortized Cost and Estimated Fair Value of Securities Available for Sale Debt Securities, Available-for-Sale [Table Text Block] Amortized cost basis Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount FHLBNY fixed rate term advances Federal Home Loan Bank Advances [Member] FHLBNY and FRBNY stock, at cost Federal Home Loan Bank Stock and Federal Reserve Bank Stock Composition of loan portfolio [Abstract] Loans and Leases Receivable, Net of Deferred Income [Abstract] Total before tax effect Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Total other real estate owned, net Other Real Estate, Foreclosed Assets, and Repossessed Assets Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Financial Assets: Assets, Fair Value Disclosure [Abstract] Capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Without single maturity date Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date Weighted average common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Demand, savings, and insured money market deposits Demand, Savings, And Insured Money Market Deposits The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice. Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Interest-earning deposits in other financial institutions Interest-earning deposits in other financial institutions Interest-Bearing Deposits in Banks and Other Financial Institutions Unfunded Loan Commitment Unfunded Loan Commitment [Member] After five, but within ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 2030 and thereafter Finance Lease, Liability, to be Paid, Year Five and After Finance Lease, Liability, to be Paid, Year Five and After Decrease (increase) in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Total non-interest income Total non-interest income Noninterest Income Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Time deposits Time Deposits Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Estimated liquidation value Estimated Liquidation Value [Member] Estimated Liquidation Value Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Deferred loan costs, net Debt Issuance Costs, Gross Amortized cost basis of loans: Financing Receivable Allowance For Finance Receivable Evaluated For Impairment [Abstract] 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] Loans, net Loans, net of deferred loan fees, and loans held for sale Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Accounting Standards Pending Adoption New Accounting Pronouncements, Policy [Policy Text Block] Increase in FHLBNY term advances, net Proceeds from Federal Home Loan Bank Term Advances Proceeds from Federal Home Loan Bank Term Advances Securities pledged carrying value Financial Instruments, Owned, at Fair Value Repayments, calls, and maturities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) Amortization of deferred costs on subordinated debt Amortization of Debt Issuance Costs Reportable segments and reconciliation to consolidated results [Abstract] Segment Reporting, Reconciliation [Abstract] Pension and other employee benefits Pension and Other Employee Benefits Pension and Other Employee Benefits 2024 Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Net cash provided by (used in) 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] Residential Real Estate Residential Real Estate [Member] After five, but within ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Security Exchange Name Security Exchange Name Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Total Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date Holding Company and CFS Holding Company And CFS [Member] Holding Company, CFS, And CRM [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Write down of equity investments Equity Method Investment, Other-than-Temporary Impairment Accrued interest receivable and other assets Interest Receivable and Other Assets Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Number of days past due after which a retail loan is rated Number Of Days Past Due After Which A Loan Will Be Rated Number Of Days Past Due After Which A Loan Will Be Rated Other real estate owned Other Real Estate Owned, Expense Other Real Estate Owned, Expense 12 months or longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Net book value Finance Lease, Right-of-Use Asset, after Accumulated Amortization Schedule of Leases in Premises and Equipment Property, Plant, and Equipment [Table Text Block] 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] Borrowed funds Interest Expense, Borrowings Amortized Cost 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] Amounts reclassified from accumulated other comprehensive income Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Pension and other employee benefits Pension and Other Postretirement Benefits Cost (Reversal of Cost) Within one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Defined Benefit and Other Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Residential mortgages Residential Mortgage [Member] Number of corporate bonds transferred out of Level 3 into Level 2 Number of Corporate Debt Investments Transferred Out Of Level 3 Into Level 2 Number of Corporate Debt Investments Transferred Out Of Level 3 Into Level 2 Asset Class [Domain] Asset Class [Domain] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average shares outstanding (in shares) Weighted average common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Interest Rate Type [Axis] Interest Rate Type [Axis] Description of interest rate type for financial instruments. 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, net of deferred loan fees Total loans, net of deferred loan fees and costs Total loans, net of deferred loan fees and costs Financing receivable Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Underlying Security Market Price Change Underlying Security Market Price Change, Percent Premises and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Unrecognized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Less: amount representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Partial redemption Debt Instrument, Partial Redemption Debt Instrument, Partial Redemption Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Treasury Stock Treasury Stock, Common [Member] Adjustment to appraised value Measurement Input, Appraised Value [Member] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Weighted-average payment delay (in months)(1) Financing Receivable, Excluding Accrued Interest, Modified in Period, Payment Delay Financing Receivable, Excluding Accrued Interest, Modified in Period, Payment Delay Amortized cost and estimated fair value of debt securities available-for-sale Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss [Abstract] Total minimum lease payments Lessee, Operating Lease, Liability, to be Paid Fair value inputs, discount to appraised value Fair Value Inputs, Discount To Appraised Value Fair Value Inputs, Discount To Appraised Value Proceeds from sales of loans held for sale Proceeds from Sale, Loan, Held-for-Sale Principal Reduction Principal Forgiveness [Member] Held to maturity, amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date 2024 Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Collateral [Domain] Collateral Held [Domain] Sale of treasury stock Proceeds from Sale of Treasury Stock Nonvested, beginning balance (in dollars per share) Nonvested, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Schedule of Components of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Transfer of portfolio loans to loans held for sale Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale Sale of shares of treasury stock (in shares) Stock Issued During Period, Shares, Treasury Stock Reissued Data processing Data processing & software expense Information Technology and Data Processing Schedule of Calculation of Basic Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] SEGMENT REPORTING Segment Reporting [Text Block] Proceeds from sales, maturities, calls, and principal paydowns on securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Minimum Minimum [Member] Investments, fair value Investments, Fair Value Disclosure Commercial and industrial Commercial And Industrial [Member] Commercial and Industrial [Member] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Change in funded status of defined benefit pension plan and other benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax [Abstract] 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] Net periodic pension benefit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other Noninterest Income, Other Operating Income Amortized cost and estimated fair value of securities held to maturity Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Sales comparison Valuation, Sales Comparison [Member] Sales Comparison [Member] Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Deferred Compensation Plan Deferred Compensation Plan [Member] Deferred Compensation Plan 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] After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Individually analyzed Amortized Cost Basis Financing Receivable, Individually Evaluated for Credit Loss Exercise Price Award Exercise Price Securities held to maturity, at amortized cost (estimated fair value of $1,560 at September 30, 2026 and $640 at December 31, 2025, net of allowance for credit losses of $0 at September 30, 2026 and December 31, 2025, respectively) Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Recurring Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Unrealized loss percentage Debt Securities, Available-for-Sale, Unrealized Loss Percentage Debt Securities, Available-for-Sale, Unrealized Loss Percentage 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] Finance lease not yet commenced Unrecorded Unconditional Purchase Obligation, Number of Leases Unrecorded Unconditional Purchase Obligation, Number of Leases Obligations of states and political subdivisions Obligations of states and political subdivisions US States and Political Subdivisions Debt Securities [Member] Special mention Special Mention [Member] Less: accumulated amortization Operating Lease, Right-Of-Use Asset, Accumulated Amortization Operating Lease, Right-Of-Use Asset, Accumulated Amortization 2023 Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Proceeds from sales of securities available for sale, gross Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-Sale Deposits Deposits [Member] Operating lease not yet commenced Lessee, Operating Lease, Lease Not yet Commenced Lessee, Operating Lease, Lease Not yet Commenced Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Purchases of equity investments, net Payment for Purchase, Investment, Operating Activity Adoption Date Trading Arrangement Adoption Date Fixed Rate Fixed Interest Rate [Member] Financial instruments or contractual agreements with a fixed interest rate. Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount FHLBNY term advances, rate Federal Home Loan Bank, Advance, Branch of FHLBank, Interest Rate Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Operating lease liabilities Present value of net minimum lease payments Operating Lease, Liability Securities held to maturity, estimated fair value Allowance for Credit Losses Total Debt Securities, Held-to-Maturity, Fair Value Long-term finance lease obligation Present value of net minimum lease payments Finance Lease, Liability Taxable securities Interest Income, Securities, Operating, Taxable Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Commercial Real Estate Commercial real estate: Commercial Portfolio Segment [Member] Collateralized mortgage obligations Collateralized Mortgage Obligations, Fair Value Disclosure Collateralized Mortgage Obligations, Fair Value Disclosure 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, Period Past Due [Domain] Financial Asset, Aging [Domain] Weighted Average Weighted Average [Member] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Holding Company and CFS Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Name of Property [Domain] Name of Property [Domain] Payments on finance leases Increases In (Payments On) Finance Leases Increases In (Payments On) Finance Leases Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Residential Mortgages Residential Mortgages Residential Portfolio Segment [Member] Loans Portfolio Segment Loans Portfolio Segment [Member] Loans Portfolio Segment Substandard Substandard [Member] Pledging Purpose [Domain] Pledging Purpose [Domain] Losses on securities transactions, net Net realized losses on securities available for sale Debt Securities, Realized Gain (Loss) Interest-earning deposits Interest Income, Deposits with Financial Institutions Income Statement [Abstract] Income Statement [Abstract] Shareholders' equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Inter-Segment Eliminations Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] Commitments period to make fixed-rate commercial draw notes (months) Commitments Period to Make Commercial Draw Notes Represents the period, for which commitments are generally made to make commercial draw notes. Obligations of states and political subdivisions Obligations of states and political subdivisions, Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents obligations of states and political subdivisions as of the balance sheet date which have been categorized as available-for-sale. SUBSEQUENT EVENTS Subsequent Events [Text Block] Amortization of right-of-use assets Operating Lease, Right-of-Use Asset, Periodic Reduction Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted–Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Collectively analyzed Financing Receivable, Collectively Evaluated for Credit Loss Amortization of unrecognized prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Total interest and dividend income Interest and dividend income Interest and Dividend Income, Operating Less: accumulated amortization Finance Lease, Right-of-Use Asset, Accumulated Amortization Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Loans Past Due 90 Days or More and Still Accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Schedule of Financing Receivable, Modified Financing Receivable, Modified [Table Text Block] Financing Receivable, Modified Accrued interest payable and other liabilities Accounts Payable and Other Accrued Liabilities Decrease (increase) in other assets Increase (Decrease) in Other Operating Assets After five, but within ten years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Measurement Basis [Axis] Measurement Basis [Axis] Acquired goodwill Goodwill, Acquired During Period Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Unrealized holding gains (losses) on securities available for sale OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Marketable Securities Marketable Securities [Member] Marketable Securities Modified contracts Financing Receivable, Modified Contracts Financing Receivable, Modified Contracts Within one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Estimated recovery rate Estimated Recovery Rate [Member] Estimated Recovery Rate Forfeitures or cancelled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Revolving Loans Amortized Cost Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Unrealized Gains and Losses on Securities Available for Sale AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Information Related To Level 3 Non-Recurring Fair Value Measurement Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Payment of subordinated debt issuance costs Payments of Debt Issuance Costs Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Financial Liabilities: Liabilities, Fair Value Disclosure [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Interest cost on projected benefit obligation Defined Benefit Plan, Interest Cost Financial Instruments [Domain] Financial Instruments [Domain] Non-interest income Noninterest Income, Adjusted Noninterest Income, Adjusted 2022 Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Interest rate swap assets Derivative assets Derivative assets Derivative Asset GOODWILL AND INTANGIBLE ASSETS Intangible Asset and Goodwill [Text Block] 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] Core Banking Core Banking Segment [Member] A segment of the Company that provides revenues by attracting deposits from the general public and using such funds to originate consumer, commercial, commercial real estate, and residential mortgage loans, primarily in the Corporation's local markets and to invest in securities. Weighted average common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic, Adjusted Weighted Average Number of Shares Outstanding, Basic, Adjusted Operating lease, weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Restricted stock units for directors' deferred compensation plan Restricted Stock Units For Directors Deferred Compensation Plan Increase and decrease in value of stock units to be issued in the future. 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