Amortized cost of securities transferred Available-for-Sale Securities, Transferred Security, at Carrying Value Available-for-Sale Securities, Transferred Security, at Carrying Value Award Timing Predetermined Award Timing Predetermined [Flag] Impairment reserve Valuation Allowance for Impairment of Recognized Servicing Assets, Balance Construction loans, percent of capital Construction Loans Actual Loan Portfolio To Company Capital The ratio of loan portfolio to Company capital for construction loans . Net unrealized loss on securities transferred from available-for-sale to held-to-maturity Unamortized balance of net unrealized losses transferred Other Comprehensive Income (Loss), Accumulated Unrealized Gain (Loss) on Transfer of Available-for-sale Securities to Held-to-maturity Other Comprehensive Income (Loss), Accumulated Unrealized Gain (Loss) on Transfer of Available-for-sale Securities to Held-to-maturity Restricted equity securities, at cost Restricted Equity Securities, At Cost Amount of stock held at Federal Home Loan Bank and Federal Reserve Bank. Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank Stock represents an equity interest in a FHLB of FRB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Interest Rate Swap March 01 2028 Interest Rate Swap March 01 2028 [Member] Interest Rate Swap March 01 2028 Entity File Number Entity File Number Securities pledged as collateral Debt Securities, Available-for-Sale, Restricted Interest rate swap agreements Interest Rate Swap [Member] Agency and mortgage-backed securities US Treasury And Government And Collateralized Mortgage-Backed Securities [Member] US Treasury And Government And Collateralized Mortgage-Backed Securities Tabular List, Table Tabular List [Table Text Block] Impact of Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Pledged Status [Axis] Pledged Status [Axis] Schedule of Estimated Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Basic earnings per common share (usd per share) Basic EPS: Income available to common shareholders (usd per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Debt securities, held-to-maturity, nonaccrual Debt Securities, Held-to-Maturity, Nonaccrual Number of shares of common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Amount of claims under review by management Financing Receivables, Subject To Annual Internal Credit Review Financing Receivables, Subject To Annual Internal Credit Review Construction loans, maximum percent of capital Construction Loan Portfolio Maximum To Company Capital The regulatory maximum allowed ratio of loan portfolio to Company capital for construction loans. Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Securities to be held to maturity Debt Securities, Held-to-Maturity, Maturity [Abstract] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Financing Receivable, Nonaccrual [Table] Financing Receivable, Nonaccrual [Table] Award Date [Axis] Award Date [Axis] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Anticipated loan prepayment rate of servicing assets (in hundredths) Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Borrowed funds – short term Short-Term Debt Home Equity Home Equity Line of Credit Portfolio [Member] Home Equity Line of Credit Portfolio [Member] Interest rate cap agreements Interest Rate Cap [Member] Unrealized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Number of private activity bonds Number of Private Activity Bonds Issued by Well-Known Customers Number of Private Activity Bonds Issued by Well-Known Customers Adjustment to Compensation, Amount Adjustment to Compensation Amount Schedule of Assets Measured on Nonrecurring Basis Measured at Fair Value Fair Value Measurements, Nonrecurring [Table Text Block] Net increase in other assets and accrued interest Increase (Decrease) in Other Operating Assets Equity compensation expense Share-Based Payment Arrangement, Noncash Expense Total Charge offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Certificates $250,000 and over Time Deposits 250000 Or More The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to more than $250,000. Debit card income Debit Card [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Consumer Loan Consumer Loan [Member] Total shareholders' equity Balance at beginning of period Balance at end of period Equity, Attributable to Parent NOW deposits Deposits, Negotiable Order of Withdrawal (NOW) Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive income (loss) net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Compensation expense recognized for restricted shares Share-Based Payment Arrangement, Expense Delinquent period for loans charged off after receipt of notification Delinquent Period for Loans Charged Off, Period After Receipt of Notification from Bankruptcy Court Delinquent Period for Loans Charged Off, Period After Receipt of Notification from Bankruptcy Court Number of shares authorized (in shares) Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Proceeds from sale of common stock (in shares) Stock Issued During Period, Shares, New Issues Total liabilities & shareholders' equity Liabilities and Equity Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Accumulated amortization Accumulated Amortization Mortgage Servicing Rights The cumulative amount of amortization for mortgage servicing rights that has been recognized in the income statement. Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Amortized Cost Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Fair Value (Estimated) Debt Securities, Available-for-Sale, Unrealized Loss Position Amortized Cost, Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Restricted Stock Restricted Stock [Member] Reclassifications Reclassifications [Text Block] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Outstanding principal balance of loans serviced for others Residential Mortgage Loans Serviced For Others Outstanding Principal Dollar amount of principal outstanding on loans being serviced for others at the balance sheet date. Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Net loss (gain) on disposal of premises and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Year One Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Assets Other Assets [Member] 90+ Days Past Due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Liabilities Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Interest on deposits with other banks Interest Income, Deposits with Financial Institutions Financing receivable term extension Financing Receivable, Modified, Weighted Average Term Increase from Modification Combination Payment Deferral, Term Extension and Rate Modification Extended Maturity, Payment Deferral And Interest Rate Reduction [Member] Extended Maturity, Payment Deferral And Interest Rate Reduction Prior Period Adjustment [Abstract] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Common Stock Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Revolving Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Payment Status (Amortized Cost Basis) Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default Proceeds from disposal of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Amortization of mortgage servicing rights Amortization of Mortgage Servicing Rights (MSRs) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Financing receivable, threshold period past due Financing Receivable, Threshold Period Past Due Net unrealized loss on hedging derivative instruments Net unrealized loss on hedging derivative instruments, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Year Three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Award Timing MNPI Considered Award Timing MNPI Considered [Flag]      Total interest expense Interest Expense, Operating Comprehensive income Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Amortized Cost, Due in 1 year or less Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Name Measure Name Fair Value (Estimated), Due in 1 year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Proceeds from maturities, payments and calls of securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Financing Receivable, Nonaccrual [Line Items] Financing Receivable, Nonaccrual [Line Items] Class of Stock [Line Items] Class of Stock [Line Items] Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Award Type [Axis] Award Type [Axis] Interest and fees on loans (tax-exempt income) Interest Income and Fees on Loans Tax Exempt Interest Income and Fees on Loans Tax Exempt Hedging Relationship [Domain] Hedging Relationship [Domain] Securities available for sale Available-for-Sale Securities, Debt Maturities [Abstract] Borrowed funds – long term Long-Term Debt Total assets Assets Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Trading Symbol Trading Symbol National certificates of deposit National Certificates of Deposit The aggregate amount of national time deposits, including certificates of deposits, individual retirement accounts and open accounts. Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Net unrealized gain on postretirement costs Net unrecognized postretirement benefits included in AOCI Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Interest and dividends on investments (tax-exempt income) Interest Income, Securities, Operating, Tax Exempt 2025 Year Awarded 2025 [Member] Year Awarded 2025 Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Restricted equity securities Federal Home Loan Bank Stock and Federal Reserve Bank Stock Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Restricted equity securities Equity Securities, Restricted [Abstract] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Net increase in short-term borrowings Proceeds from (Repayments of) Short-Term Debt Number of post-retirement benefit plans Number Of Post Retirement Benefit Plans Number of post-retirement benefit plans sponsored by the company. Interest on borrowed funds Interest Expense, Borrowings Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Non-accrual with Allowance for Credit Loss Financing Receivable, Nonaccrual, With Allowance Financing Receivable, Nonaccrual, With Allowance Other Other Collateral [Member] Other Collateral Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Entity Emerging Growth Company Entity Emerging Growth Company Securities to be held to maturity, fair value Fair Value (Estimated) Fair Value (Estimated) Securities to be held to maturity (net of allowance for credit losses) Debt Securities, Held-to-Maturity, Fair Value Cash dividends declared (in usd per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Specific Reserves on Loans Evaluated Individually Specific Reserves on Loans Evaluated Individually for Impairment [Member] Specific reserved based on evaluating each loan individually. Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] 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] Non-interest income Revenue from Contract with Customer, Including Assessed Tax Level 2 Fair Value, Inputs, Level 2 [Member] Fair Value (Estimated), Due in 5 to 10 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Fair value of securities transferred Available-for-Sale Securities, Transferred Security, at Fair Value Available-for-Sale, Transferred Security, at Fair Value Number of states Number Of States in New England Where FHLB Serve The number of States in New England where Federal Home Loan Bank do housing and financing services.      Total non-interest income Noninterest Income Number of shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Asset Pledged as Collateral Asset Pledged as Collateral [Member] Net gain on sales of loans Gain (Loss) on Sales of Loans, Net Plan Name [Axis] Plan Name [Axis] Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss PEO PEO [Member] Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Non-interest expense Noninterest Expense [Abstract] Schedule of Contractual Maturities of Investment Securities Investments Classified by Contractual Maturity Date [Table Text Block] Financing Receivable Allowance [Domain] Class of Financing Receivable [Domain] Non-cash transactions Noncash Investing and Financing Items [Abstract] Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate adjustment factor (in hundredths) Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate Adjustment Factor The amount of rate spread added to the ten-year US Treasury rate to derive the discount rate used in the fair value calculation for the loan servicing portfolio. 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] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Swap Type [Axis] Derivative Swap Type [Axis] Derivative Swap Type Certificates of deposit Total certificates of deposit Local certificates of deposit Time Deposits Change in benefit obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Retained earnings Retained Earnings [Member] Fair Value (Estimated), Due in 1 to 5 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Interest and dividends on investments (includes YTD tax-exempt income of $1,902,000 for March 31, 2026 and $1,955,000 for March 31, 2025) Interest and Dividend Income, Securities, Operating Income Statement [Abstract] Income Statement [Abstract] Cash and cash equivalents Cash and cash equivalents at beginning of period      Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Derivative assets Derivative Asset Income tax expense Income Tax Expense (Benefit) Funded status Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] Fair Value (Estimated) (12 months or more) Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Unrealized (losses) gains rising during the period Unrealized losses on cash flow hedging derivatives arising during the period OCI, before Reclassifications, before Tax, Attributable to Parent Agriculture Agriculture Loan [Member] Agriculture Loan Other assets Other Assets Fair Value, Measurements, Nonrecurring Fair Value, Nonrecurring [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Modified [Table] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Federal Reserve Bank Stock Federal Reserve Bank Stock Change in restricted equity securities Increase (Decrease) in Restricted Equity Securities Increase (Decrease) in Restricted Equity Securities Credit loss reduction - off-balance sheet credit exposures Credit loss reduction Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Securities available for sale Debt Securities, Available-for-Sale [Abstract] Hedging Relationship [Axis] Hedging Relationship [Axis] Fair Value (Estimated), Due in 1 year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Net unrealized loss on securities available-for-sale AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Certificates $100,000 to $250,000 Time Deposits Greater Than 100000 And Less Than 250000 The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to more than $100,000 but less than $250,000. Notional Amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Revolving Loans Amortized Cost Basis Financing Receivable, Excluding Accrued Interest, Revolving Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code City Area Code Schedule of Allowance for Loan Losses by Class of Financing Receivable and Allowance Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Effect of one percentage point increase on service cost Effect of One Percentage Point Increase on Service Cost Components The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service cost components of net periodic postretirement health care benefit costs. Other operating income Noninterest Income, Other Operating Income Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Schedule of Composition of Loan Portfolio Schedule Of Composition Of Loan Portfolio [Table Text Block] Tabular disclosure of the composition of loans contained in the loan portfolio. Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table]      Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accrued interest receivable Interest Receivable Defined contribution plan, employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Fair Value Hedging Fair Value Hedges Fair Value Hedging [Member] Proceeds from sales of securities available for sale Proceeds from Sale of Debt Securities, Available-for-Sale Securities available for sale Fair Value (Estimated) Fair Value (Estimated) Debt Securities, Available-for-Sale, Excluding Accrued Interest Proceeds from sales of other real estate owned Proceeds from Sale of Other Real Estate Cash Flow Hedges Cash Flow Hedging [Member] Net interest income Interest Income (Expense), Operating Other liabilities Other Liabilities Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Income (Numerator) Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Financing Receivable Information by Type of Reserve [Domain] Financing Receivable Information by Type of Reserve [Domain] Type of reserves based on individual impairment, historical loss experience, or qualitative factors. Real Estate Owner Occupied Real estate Real Estate Loan [Member] Equity Components [Axis] Equity Components [Axis] Year Four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Related income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Mortgage Servicing Rights Transfers and Servicing of Financial Assets [Text Block] Commercial Real Estate Commercial Real Estate [Member] Other Performance Measure, Amount Other Performance Measure, Amount U.S. Treasury & Agency securities US Treasury and Government [Member] Entity Address, State or Province Entity Address, State or Province Substandard (risk rating 7) Substandard [Member]      Total interest income Interest and Dividend Income, Operating Special Mention (risk rating 6) Special Mention [Member] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Fair Value Fair Value Measurement, Policy [Policy Text Block] Total loans Loans Receivable, Fair Value Disclosure Derivative Instrument [Axis] Derivative Instrument [Axis] Issuance of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Individual: Individual [Axis] Expense related to 401(k) plan Defined Contribution Plan, Cost Vesting [Axis] Vesting [Axis] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Financial liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Schedule of Allowance for Loan Losses Transactions Activity In Allowance For Loan Losses By Portfolio And Segment [Table Text Block] Tabular disclosure for the roll forward of change in allowance for loan losses from period to period and related loan balances.      Net cash used by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation 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] Number of individual companies Number of Individual Companies in Banking Industry Number of Individual Companies in Banking Industry Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Defined contribution plan employer maximum percentage match of annual salary based on employee contribution Defined Contribution Plan Employer Maximum Percentage Match Of Employee Annual Salary The highest percentage of employer match of employee contribution to defined contribution plan based on annual salary. Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Amortization of investment in limited partnership Other Depreciation and Amortization Entity Interactive Data Current Entity Interactive Data Current Carrying value Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Remaining Term (In Years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Modified [Line Items] Home Equity Line of Credit Home Equity Line of Credit [Member] Investment management and fiduciary income Fiduciary and Trust [Member] Accrued benefit cost at end of period Defined Benefit Plan, Funded (Unfunded) Status of Plan Equity [Abstract] Equity [Abstract] Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity [Member] Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity [Member] Net gain on sale of other real estate owned Gains (Losses) on Sales of Other Real Estate Total Non-accrual Financing Receivable, Nonaccrual Credit loss (reduction) expense Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) Interest income Interest and Dividend Income, Operating [Abstract] Defined contribution plan service period (in months) Deferred Compensation Arrangement with Individual, Requisite Service Period      Total non-interest expense Noninterest Expense (Increase) decrease in interest-bearing deposits in other banks Interest-Bearing Deposits in Other Banks Interest-Bearing Deposits in Other Banks Financial Derivative Instruments Derivatives, Policy [Policy Text Block] 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] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Payment Deferral Payment Deferral [Member] Expected future benefit payments, current year Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year Allowance for Credit Losses Allowance for Credit Losses [Text Block] Interest on deposits Interest Expense, Deposits Total borrowed funds Debt and Lease Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities Schedule of Available For Sale Held to Maturity and Restricted Equity Securities [Table Text Block] Tabular presentation of available for sale securities, held-to-maturity securities and restricted equity securities as of the balance sheet date. Non-interest income Noninterest Income [Abstract] Doubtful (risk rating 8) Doubtful [Member] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Receive Fixed, Pay Variable Receive Fixed, Pay Variable [Member] Receive Fixed, Pay Variable Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of identified intangibles Amortization of Intangible Assets Delinquent period before consumer loans are charged off Delinquent Period Before Consumer Loans Charged Off Delinquent Period Before Consumer Loans Charged Off Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] 0.5 Years Six Months [Member] Six Months Construction loans and non-owner-occupied commercial real estate loans, percent of capital Construction And Non Owner Occupied Commercial Real Estate Loans Portfolio To Company Capital The actual ratio of loan amount to Company capital for construction and non-owner-occupied commercial real estate. Entity Central Index Key Entity Central Index Key PEO Name PEO Name 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] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Credit Quality Risk Ratings for Loans Financing Receivable Credit Quality Indicators [Table Text Block] Schedule of Individually Analyzed Loans by Class of Financing Receivable Collateral-dependent Loans [Table Text Block] Collateral-dependent Loans Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Loans originated for resale Payment for Origination, Loan, Mortgage, Held-for-Sale Arrangement Duration Trading Arrangement Duration Carrying value Servicing Asset at Amortized Cost, Fair Value Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Payment to repurchase common stock (in shares) Stock Repurchased and Retired During Period, Shares Beginning balance Total ending allowance balance Off-Balance-Sheet, Credit Loss, Liability Schedule of Certificates of Deposit Time Deposits [Table Text Block] The tabular disclosure of the breakdown of the balance of time deposits. Assets Assets Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] General Reserves on Loans Based on Historical Loss Experience General Reserves Based on Historical Loss Experience [Member] General reserves for types of portfolios of loans based on historical loss experience. Vesting [Domain] Vesting [Domain] Retirement Benefits, Description [Abstract] Retirement Benefits, Description [Abstract] Fair Value Fair Value Disclosures [Text Block] Employee Benefit Plans Retirement Benefits [Text Block] Shareholders' equity Equity, Attributable to Parent [Abstract] 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] Entity Address, Address Line One Entity Address, Address Line One Schedule of Troubled Debt Restructurings on Financing Receivables Financing Receivable, Modified [Table Text Block] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Repurchase agreements Assets Sold under Agreements to Repurchase, Repurchase Liability 30-59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Schedule of Acronyms, Abbreviations and Definitions Schedule Of Acronyms, Abbreviations And Definitions [Table Text Block] Schedule Of Acronyms, Abbreviations And Definitions Mortgage servicing rights Mortgage Servicing Rights Gross Gross amount, as of the balance sheet date, of mortgage servicing rights. Total credit loss expense Credit loss expense Credit Loss, Expense (Reversal) Credit Loss, Expense (Reversal) Revolving Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Allowance for credit losses: Off-Balance-Sheet, Credit Loss, Liability [Roll Forward] Capital Purchase Program Capital Purchase Program [Member] Capital Purchase Program [Member] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Net unrealized loss, net of taxes on transferred securities Available-for-sale Securities, Transferred to Held-to-maturity Securities, Accumulated Unrealized Gain (Loss) Available-for-sale Securities, Transferred to Held-to-maturity Securities, Accumulated Unrealized Gain (Loss) Financial Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Valuation allowance on impaired financing receivable Impaired Financing Receivable, Related Allowance, Measured at Fair Value Impaired Financing Receivable, Related Allowance, Measured at Fair Value Amortized Cost, Due in 5 to 10 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Other Other Loans [Member] Other Loans Other Liabilities Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Delinquent period for loans charged off Delinquent Period for Loans Charged Off Delinquent Period for Loans Charged Off Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Municipal Bonds Municipal Bonds [Member] Year Five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Interest Rate Cap July 01 2028 at 4.550% Interest Rate Cap July 01 2028 at 4.550% [Member] Interest Rate Cap July 01 2028 at 4.550% Salaries and employee benefits Labor and Related Expense Allowance for loan losses as a percent of total loans Allowance for Loan Losses of Total Loans, Percentage Allowance for Loan Losses of Total Loans, Percentage Premises and equipment, net Property, Plant And Equipment And Operating Lease Right-Of-Use Asset, Net Of Accumulated Depreciation And Amortization Property, Plant And Equipment And Operating Lease Right-Of-Use Asset, Net Of Accumulated Depreciation And Amortization Grants during the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Unrecognized compensation costs Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Fair Value (Estimated) (Less than 12 months) Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Total assets Assets, Fair Value Disclosure Certificates of Deposit Deposit Liabilities Disclosures [Text Block] Deposits [Abstract] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] All Past Due Financial Asset, Past Due [Member] Schedule of Nonaccrual Loans Financing Receivable, Nonaccrual [Table Text Block] Fair value of mortgage servicing rights Mortgage servicing rights Servicing Asset at Fair Value, Amount Net amortization of premiums on investments Accretion (Amortization) of Discounts and Premiums, Investments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Customer loan interest swap agreements Customer Loan Interest Swap [Member] Customer Loan Interest Swap [Member] Interest cost Defined Benefit Plan, Interest Cost Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Schedule of Accumulated Postretirement Benefit Obligation and Funded Status Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] 2024 Year Awarded 2024 [Member] Year Awarded 2024 Non-PEO NEO Non-PEO NEO [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Tangible book value per common share (usd per share) Tangible Book Value Per Common Share Tangible book value of common stock per share. Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name Award Type [Domain] Award Type [Domain] Award Type [Domain] Individually analyzed loans Impaired Loans Fair Value Disclosure This element represents the fair value disclosure of impaired loans that have had a fair value adjustment since their initial recognition. Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Term Term Term Loan [Member] The catagory of loans which are designated to individuals for a residence that typically includes traditional amortizing home mortgages. Number of units Number of Units in Commercial Multifamily Properties Number of Units in Commercial Multifamily Properties Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Total Estimated fair value Estimate of Fair Value Measurement [Member] Net unrealized gain on transferred securities, net of taxes Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax Available-for-sale Securities, Transferred to Held-to-maturity Securities, Unrealized Gain (Loss) Available-for-sale Securities, Transferred to Held-to-maturity Securities, Unrealized Gain (Loss) Share Repurchase Program [Axis] Share Repurchase Program [Axis] 2020 Plan 2020 Equity Incentive Plan [Member] 2020 Equity Incentive Plan MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Amortized Cost, Due in 1 to 5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Name Awards Close in Time to MNPI Disclosures, Individual Name Amortized Cost, Due in 1 to 5 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Net unrealized gain on cash flow hedging derivative instruments AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Interest Rate Cap July 01 2028 at 4.050% Interest Rate Cap July 01 2028 at 4.050% [Member] Interest Rate Cap July 01 2028 at 4.050% Service charges on deposit accounts Deposit Account [Member] Certificates of deposit less than $100,000 Time Deposits, Less than $100,000 Net deferred loan costs Financing Receivable, Deferred Commitment Fee Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Amortized Cost, Due in 5 to 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Equity compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Reserves for Qualitative Factors Reserve For Qualitative Factors, Netting [Member] Reserve For Qualitative Factors, Netting Interest Rate Swap January 01 2026 Interest Rate Swap January 01 2026 [Member] Interest Rate Swap January 01 2026 Financial Instruments [Domain] Financial Instruments [Domain] Fair Value (Estimated), Due after 10 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Award Date [Domain] Award Date [Domain] Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Benefit obligation at beginning of year Benefit obligation at end of period Benefit obligation at end of period Defined Benefit Plan, Benefit Obligation Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Combination Payment Deferral and Term Extension Extended Maturity and Payment Deferral [Member] Extended Maturity and Payment Deferral Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Delinquent period before residential loans are placed on non-accrual status Delinquent Period Before Residential Loans Placed On Non Accrual Status The minimum amount of days past due at which residential loans are placed on non-accrual status.. Collateral posted Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Accumulated Net Investment Gain (Loss) Attributable to Parent AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Loan-to-value percent, commercial real estate Commercial Real Estate Loans Maximum Loan To Value The maximum percentage of loan to value for commercial real estate loans based on current appraisal information. Interest expense Interest Expense, Operating and Nonoperating [Abstract] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Other real estate owned, valuation allowance Real Estate Owned, Valuation Allowance Fair Value Measurement [Domain] Fair Value Measurement [Domain] Post-retirement benefit plan health insurance subsidy range minimum per month per person Post Retirement Benefit Plan Health Insurance Subsidy Range Minimum The minimum amount employer will contribute per month to post-retiree for subsidizing the cost of health care insurance. Purchases of securities available for sale Payments to Acquire Debt Securities, Available-for-Sale Aggregate Available Trading Arrangement, Securities Aggregate Available Amount State and political subdivisions State and Political Subdivisions US States and Political Subdivisions Debt Securities [Member] Year Two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Diluted EPS: Income available to common shareholders plus assumed conversions Net Income (Loss) Available to Common Stockholders, Diluted Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Amortized Cost, Due after 10 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 All Executive Categories All Executive Categories [Member] Collateral [Domain] Collateral Held [Domain] Shareholders' equity Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Common stock, one cent par value per share Common Stock, Value, Issued 90+ Days & Accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Interest and fees on loans (includes YTD tax-exempt income of $591,000 for March 31, 2026 and $721,000 for March 31, 2025) Interest and Fee Income, Loans and Leases Diluted EPS: Income available to common shareholders plus assumed conversions (in shares) Weighted Average Number of Shares Outstanding, Diluted Year One Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Transition Report Document Transition Report Fair Value (Estimated), Due in 1 to 5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Mortgage loans in the process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Impact of Recently Issued Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Underlying Securities Award Underlying Securities Amount Repayment on long-term borrowings Repayments of Other Long-Term Debt Gross realized gains Debt Securities, Available-for-Sale, Realized Gain Change in net unrealized loss on available for sale securities, net of tax Increase (Decrease) In Net Unrealized Gain (Loss) On Available For Sale Securities, Net Of Tax Increase (Decrease) In Net Unrealized Gain (Loss) On Available For Sale Securities, Net Of Tax Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Fair Value (Estimated), Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Schedule of Activity in the ACL for Held-to-maturity Debt Securities Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] Percentage of loans receivable, by type Percentage of Financing Receivable, By Type Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio. Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] Income Taxes Income Tax Disclosure [Text Block] Net increase in certificates of deposit Increase (Decrease) in Time Deposits Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 60-89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Hedging Designation [Axis] Hedging Designation [Axis] Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Federal Home Loan Bank advances Long-Term Federal Home Loan Bank Advances Product and Service [Axis] Product and Service [Axis] Number of Positions Derivative, Number of Instruments Held Interest Rate Cap March 01 2029 at 3.750% Interest Rate Cap March 01 2029 at 3.750% [Member] Interest Rate Cap March 01 2029 at 3.750% Revolving Loans Amortized Cost Basis Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Derivative Contract [Domain] Derivative Contract [Domain] Proceeds from sale of common stock Proceeds from Issuance of Common Stock All Individuals All Individuals [Member] Residential Real Estate Residential Real Estate [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Proceeds from sales and transfers of loans Proceeds from Sale, Loan, Held-for-Sale Mortgage origination and servicing income, net of amortization Mortgage Banking [Member] 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] Financing receivable, individually evaluated for impairment Financing Receivable, Individually Evaluated for Credit Loss 2026 Year Awarded 2026 [Member] Year Awarded 2026 Year Two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Non-accrual with no Allowance for Credit Loss Financing Receivable, Nonaccrual, No Allowance Fixed Rate Paid Derivative, Fixed Interest Rate Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Impairment losses Restricted Equity Securities Unrealized Losses As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss. Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Year Five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Basic EPS: 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] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Other comprehensive (loss) gain Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Moving average of weekly prepayment data (in months) Moving Average Of Weekly Prepayment Data The moving average period of weekly prepayment data used as assumption in evaluating the carrying value of mortgage servicing rights. Real estate owner occupied Real Estate Loan, Owner Occupied [Member] Real Estate Loan, Owner Occupied Commercial Commercial Portfolio Segment [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Diluted earnings per common share (usd per share) Diluted EPS: Income available to common shareholders plus assumed conversions (usd per share) Earnings Per Share, Diluted FDIC insurance premiums Federal Deposit Insurance Corporation Premium Expense Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Credit loss expense (reduction) Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Multifamily Multifamily [Member] Allowance for credit losses: Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] Fair Value (Estimated), Due in 5 to 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Securities Gains and Losses Schedule of Realized Gain (Loss) [Table Text Block] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Recoveries Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Estimated plan expense Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Amortized Cost Basis Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Net decrease in demand, savings, and money market accounts Increase (Decrease) in Demand Deposits, Savings Deposits, and Money Market Accounts Increase (Decrease) in Demand Deposits, Savings Deposits, and Money Market Accounts Furniture and equipment expense Equipment Expense Commercial Loan Commercial Loan [Member] Accrued pension liability Liability, Defined Benefit Pension Plan Pension expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Earnings Per Share [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Mortgage servicing rights capitalized Servicing Asset at Fair Value, Additions Loan maturities Financing Receivable, Term Financing Receivable, Term Deferred tax expense Accumulated Other Comprehensive Income Defined Benefit Plans Tax, Deferred Tax Benefit Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. Term Extension Extended Maturity [Member] Year Three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Payment to repurchase common stock Stock Repurchased and Retired During Period, Value Construction loans and non-owner-occupied commercial real estate loans, maximum percent of capital Construction And Non Owner Occupied Commercial Real Estate Loans Maximum Loan Portfolio To Company Capital The regulatory maximum allowed ratio of loan portfolio to Company capital for construction and non-owner-occupied commercial real estate. Unamortized gain Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] 1.0 Year One Year [Member] One Year [Member] 0.2 Years Two Months Twelve Days [Member] Two Months Twelve Days Effect of one percentage point increase on accumulated benefit obligation Defined Benefit Plan, Effect of One-Percentage-Point Increase on Accumulated Postretirement Benefit Obligation Loan to value ratio Financing Receivable, Loan to Value Ratio Financing Receivable, Loan to Value Ratio Award Timing Disclosures [Line Items] Effect of one percentage point increase on interest cost Effect of One Percentage Point Increase on Interest Cost Components The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the interest cost components of net periodic postretirement health care benefit costs. Book value per common share (usd per share) Book Value Per Common Share Book value of common stock per share. Measurement Frequency [Domain] Measurement Frequency [Domain] Number of securities temporarily impaired (security) Number Of Securities Temporarily Impaired The number of securities with unrealized losses, classified as temporarily impaired, held in a Company's portfolio as of the balance sheet date. Net unrealized (loss) gain on securities available for sale, net of taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Common Stock Equity [Text Block] Loans Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Interest Rate Cap March 01 2030 at 4.250% Interest Rate Cap March 01 2030 at 4.250% [Member] Interest Rate Cap March 01 2030 at 4.250% Net loans Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss NET INCOME Net income Net income as reported Net Income (Loss) Attributable to Parent 3.0 Years Three Years [Member] Equity-based compensation plans that vest in three years. Schedule of Temporary Impairment Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Schedule of Net Periodic Benefit Cost Not Yet Recognized Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Number of loan classes Financing Receivables, Number Of Loan Classes Financing Receivables, Number Of Loan Classes Net increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Vesting Term (In Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Less allowance for credit losses HTM allowance for credit losses Beginning balance Total ending allowance balance Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Payment to repurchase common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Total loans Risk-rated [Member] Risk-rated Construction Construction Loans [Member] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] Collateral [Axis] Collateral Held [Axis] Amortized Cost, Due in 1 year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One C&I Commercial And Industrial Loans [Member] Commercial And Industrial Loans Retained earnings Retained Earnings (Accumulated Deficit) Money market deposits Deposits, Money Market Deposits Residential Residential Residential Portfolio Segment [Member] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] Unrealized Losses (12 months or more) Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Purchases of securities to be held to maturity Payments to Acquire Held-to-Maturity Securities Current Fiscal Year End Date Current Fiscal Year End Date Assumed health care cost trend rate Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Accumulated Net Gain (Loss) from Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Unrealized Losses (Less than 12 months) Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Total deposits Deposits 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] Number of mortgage loans in the process of foreclosure Mortgage Loans in Process of Foreclosure, Number Mortgage Loans in Process of Foreclosure, Number Federal Home Loan Bank Stock Federal Home Loan Bank Stock Statement [Table] Statement [Table] Derivative liabilities Derivative Liability Pay Fixed, Receive Variable Pay Fixed, Receive Variable [Member] Pay Fixed, Receive Variable Change in deferred taxes Deferred Income Tax Expense (Benefit) 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] Post-retirement benefit plan health insurance subsidy range maximum per month per person Post Retirement Benefit Plan Health Insurance Subsidy Range Maximum The maximum amount employer will contribute per month to post-retiree for subsidizing the cost of health care insurance. Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Other operating expense Other Noninterest Expense Interest Rate Swap August 01 2025 Interest Rate Swap August 01 2025 [Member] Interest Rate Swap August 01 2025 Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Pass (risk rating 1-5) Pass [Member] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Schedule of Assets and Liabilities Measured on Recurring Basis Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Shares (Denominator) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Real estate non-owner occupied Real Estate non-owner occupied Real Estate Loan, Non-Owner Occupied [Member] Real Estate Loan, Non-Owner Occupied All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, by Balance Sheet Grouping [Table] Rate Mod Contractual Interest Rate Reduction [Member] Amendment Flag Amendment Flag Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Schedule of Past Due Loans Aging Financing Receivable, Past Due [Table Text Block] Transfers and Servicing [Abstract] Transfers and Servicing [Abstract] Termination Date Trading Arrangement Termination Date Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Interest bearing deposits in other banks Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Less allowance for credit losses Total Reserves Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Credit loss expense - loans Financing Receivable, Credit Loss, Expense (Reversal) Total share based compensation cost Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Recognized And Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Recognized And Not yet Recognized Fair Value Derivative, Fair Value, Net Unfunded, supplemental retirement benefits payable period Post Employment Plan, Supplemental Benefits, Payment Period Upon Retirement Or Death Post Employment Plan, Supplemental Benefits, Payment Period Upon Retirement Or Death Outstanding loans and commitments subject by independent consulting firm Financing Receivable, Outstanding Loans And Commitments Subject By Independent Consulting Firm Percentage of loans and commitments subject to review by an independent consulting firm each year. Basic EPS: Income available to common shareholders (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Basic and Diluted Earnings per Share (EPS) Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Securities to be held to maturity Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Consumer Consumer Portfolio Segment [Member] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Net acquisition amortization Amortization of Acquisition Costs Demand deposits Demand Deposit Accounts Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Common stock and additional paid-in capital Common Stock Including Additional Paid in Capital [Member] Entity Tax Identification Number Entity Tax Identification Number Credit loss (reduction) expense - debt securities HTM Debt Securities, Held-to-Maturity, Credit Loss Expense (Reversal) Year Four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Reclassification of net realized gains during the period Amortization of net unrealized gains Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Cash dividends declared Dividends, Cash Net securities gains Net gain on sale or call of securities Net gain Debt Securities, Available-for-Sale, Realized Gain (Loss) Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock par value (usd per share) Common Stock, Par or Stated Value Per Share Number of shares issued (in shares) Common Stock, Shares, Issued Schedule of ACL for Off-balance Sheet Credit Exposure Schedule Of Off-Balance Sheet Allowance [Table Text Block] Schedule Of Off-Balance Sheet Allowance Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Dividends paid Payments of Dividends Interest Rate Swap March 01 2026 Interest Rate Swap March 01 2026 [Member] Interest Rate Swap March 01 2026 Related deferred taxes Related deferred taxes Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Occupancy expense Occupancy, Net Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Securities charged-off Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Unamortized net actuarial gain Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Insider Trading Arrangements [Line Items] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Security Exchange Name Security Exchange Name Net increase in loans Payments to Acquire Finance Receivables Current Financial Asset, Not Past Due [Member] AFS allowance Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Other equity securities Equity Securities [Member] Total liabilities Liabilities Mortgage-backed securities Collateralized Mortgage-Backed Securities [Member] % of Total Class of Financing Receivable Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Financing Receivable Information by Type of Reserve [Axis] Financing Receivable Information by Type of Reserve [Axis] Type of reserves based on individual impairment, historical loss experience, or qualitative factors. Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Derivative Swap Type [Domain] Derivative Swap Type [Domain] Derivative Swap Type Other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Savings deposits Deposits, Savings Deposits Proceeds from sale of common stock Proceeds from sale of common stock Stock Issued During Period, Value, New Issues Statement [Line Items] Statement [Line Items] Asset-backed securities Asset-Backed Securities [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Interest Rate Swap March 01 2027 Interest Rate Swap March 01 2027 [Member] Interest Rate Swap March 01 2027 Municipal Municipal Municipal Portfolio Segment [Member] Class of loans receivable which are related to municipalities or other city governments. Schedule of Reconciliation of Mortgage Servicing Assets Reconciliation of Mortgage Servicing Rights [Table Text Block] A tabular presentation of the net mortgage servicing rights as of the balance sheet date. Proceeds from maturities, payments, calls and sales of securities to be held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Securities held-to-maturity (net of ACL), fair value of $308,676,000 at March 31, 2026, $315,482,000 at December 31, 2025 and $312,788,000 at March 31, 2025 Net securities to be held to maturity Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate securities Corporate Securities Corporate Debt Securities [Member] Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Effect of dilutive securities: restricted stock (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) [Abstract] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) [Abstract]