Cover [Abstract] Entity Registrant Name Entity Central Index Key Document Type Amendment Flag Current Fiscal Year End Date Entity Small Business Entity Shell Company Entity Emerging Growth Company Entity Current Reporting Status Document Period End Date Entity Filer Category Document Fiscal Period Focus Document Fiscal Year Focus Entity Common Stock Shares Outstanding Document Quarterly Report Document Transition Report Entity File Number Entity Incorporation State Country Code Entity Tax Identification Number Entity Address Address Line 1 Entity Address City Or Town Entity Address State Or Province Entity Address Postal Zip Code City Area Code Local Phone Number Entity Interactive Data Current Security 12b Title Trading Symbol Security Exchange Name Consolidated Balance Sheets Assets Cash and due from banks Federal funds sold and overnight deposits Total cash and cash equivalents [Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation] Securities available-for-sale (amortized cost $130,162,738 and $156,694,754 at 09/30/26 and 12/31/25, respectively) Restricted equity securities, at cost Loans held-for-sale Loans Allowance for credit losses [Financing Receivable, Allowance for Credit Loss] Deferred net loan costs Net loans [Financing Receivable, after Allowance for Credit Loss, Current] Bank premises and equipment, net Accrued interest receivable Bank owned life insurance Goodwill Other real estate owned Other assets Total assets [Assets] Liabilities and Shareholders' Equity Liabilities Deposits: Demand, non-interest bearing Interest-bearing transaction accounts Money market funds Savings Time deposits, $250,000 and over Other time deposits Total deposits [Deposits] Repurchase agreements Borrowed funds Junior subordinated debentures Accrued interest and other liabilities Total liabilities [Liabilities] Shareholders' Equity Common stock - $2.50 par value; 15,000,000 shares authorized, 5,910,960 shares issued at 09/30/26 and 5,882,266 shares issued at 12/31/25 Additional paid-in capital [Additional Paid in Capital] Retained earnings [Retained Earnings (Accumulated Deficit)] Accumulated other comprehensive loss Less: treasury stock, at cost; 300,409 shares at 09/30/26 and 299,339 shares at 12/31/25 [Treasury Stock, Common, Value] Total shareholders' equity [Equity, Attributable to Parent] Total liabilities and shareholders' equity [Liabilities and Equity] Book value per common share outstanding Time deposits Amortization cost on securities available for sale Shareholder's Equity Common stock par value (in dollars per share) Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Treasury stock (in shares) Consolidated Statements of Income (Unaudited) Interest income Interest and fees on loans Interest on taxable debt securities Interest on tax-exempt debt securities Dividends Interest on federal funds sold and overnight deposits Total interest income [Interest and Dividend Income, Operating] Interest expense Interest on deposits Interest on borrowed funds Interest on repurchase agreements Interest on junior subordinated debentures Total interest expense [Interest Expense, Operating and Nonoperating] Net interest income [Interest Income (Expense), Operating] Credit loss expense Net interest income after credit loss expense [Interest Income (Expense), after Provision for Loan Loss] Non-interest income Service fees Income from sold loans Other income from loans Income from investment in CFS Partners Other income Total non-interest income [Noninterest Income] Non-interest expense Salaries and wages Employee benefits Occupancy expenses, net Other expenses Total non-interest expense [Noninterest Expense] Income before income taxes [Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest] Income tax expense Net income [Net Income (Loss) Attributable to Parent] Earnings per common share Weighted average number of common shares used in computing earnings per share Dividends declared per common share Consolidated Statements of Comprehensive Income (Unaudited) Net income Other comprehensive income Unrealized (loss) gain on securities AFS arising during the period Tax effect [Other Comprehensive Income (Loss), Tax] Other comprehensive (loss) income, net of tax [Other Comprehensive Income (Loss), Net of Tax] Total comprehensive income [Comprehensive Income (Loss), Net of Tax, Attributable to Parent] Consolidated Statements of Changes in Shareholders' Equity (Unaudited) Statement [Table] Statement [Line Items] Equity Components [Axis] Common Stock Preferred Stock Additional paid-in capital Additional Paid-in Capital [Member] Retained earnings Retained Earnings [Member] AOCI Treasury stocks Balance, amount Issuance of common stock Cash dividends declared common stock [Dividends, Common Stock, Cash] Cash dividends declared preferred stock [Dividends, Preferred Stock, Cash] Shares purchased through stock buyback plan Net income Other comprehensive income Balance, amount Consolidated Statements of Cash Flows (Unaudited) Cash Flows from Operating Activities: Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization, bank premises and equipment Credit loss expense Deferred income tax benefit Gain on sale of loans [Gain (Loss) on Sale of Loans and Leases] (Gain) loss on sale of bank premises and equipment [Gain (Loss) on Disposition of Property Plant Equipment] Gain on sale of OREO [Gains (Losses) on Sales of Other Real Estate] Income from CFS Partners [Income from CFS Partners] Amortization of bond premium, net Proceeds from sales of loans held for sale Originations of loans held for sale [Payment for Origination and Purchase, Loan, Held-for-Sale] Increase in taxes payable (Increase) decrease in interest receivable [Increase (Decrease) in Accrued Interest Receivable, Net] Decrease in mortgage servicing rights Decrease in right-of-use assets [Decrease in right-of-use assets] (Decrease) increase in operating lease liabilities Decrease in other assets [Increase (Decrease) in Other Operating Assets] Increase in cash surrender value of BOLI [Life Insurance, Corporate or Bank Owned, Change in Value] Amortization of limited partnerships Change in net deferred loan fees and costs [Increase (Decrease) in Loans, Deferred Income] Decrease in interest payable Increase (decrease) in accrued expenses Decrease in other liabilities Net cash provided by operating activities [Cash Provided by (Used in) Operating Activity, Including Discontinued Operation] Cash Flows from Investing Activities: Investments - AFS Maturities, calls, pay downs and sales Purchases [Payments to Acquire Debt Securities, Available-for-Sale] Proceeds from redemption of restricted equity securities Purchases of restricted equity securities [Payments to Acquire Restricted Investments] Decrease in limited partnership contributions payable [Payments to Acquire Limited Partnership Interests] Investments in limited liability entities [Payments to Acquire Other Investments] Increase in loans, net [Payment for Acquisition, Loan, Held-for-Investment] Capital expenditures net of proceeds from sales of bank premises and equipment [Payments to Acquire Property, Plant, and Equipment] Proceeds from sales of OREO Recoveries of loans charged off Net cash used in investing activities [Cash Provided by (Used in) Investing Activity, Including Discontinued Operation] Cash Flows from Financing Activities: Net increase (decrease) in demand and interest-bearing transaction accounts Net decrease in money market and savings accounts Net increase in time deposits Net decrease in repurchase agreements Net decrease in short-term borrowings [Repayments of Short-Term Debt] (Repayment of) proceeds from long-term borrowings Decrease in finance lease obligations [Repayments of Debt and Lease Obligation] Shares purchased through stock buyback program [Shares purchased through stock buyback program] Dividends paid on preferred stock [Payments of Ordinary Dividends, Preferred Stock and Preference Stock] Dividends paid on common stock [Payments of Ordinary Dividends, Common Stock] Net cash used in financing activities [Cash Provided by (Used in) Financing Activity, Including Discontinued Operation] Net decrease in cash and cash equivalents [Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation] Cash and cash equivalents: Beginning Ending Supplemental Schedule of Cash Paid During the Period: Interest Income taxes, net of refunds Supplemental Schedule of Noncash Investing and Financing Activities: Change in unrealized (loss) gain on securities AFS Additions to operating lease liabilities Investment in limited partnerships, not yet paid Common Shares Dividends Paid: Dividends declared Increase in dividends payable attributable to dividends declared Dividends reinvested Total dividends paid Insider Trading Arrangements Insider Trading Arrangements [Line Items] Rule 10b5-1 Arrangements Adopted [Flag] Rule 10b5-1 Arrangements Terminated [Flag] Non Rule 10b5-1 Arrangements Adopted [Flag] Non Rule 10b5-1 Arrangements Terminated [Flag] Basis of Presentation and Consolidation and Certain Definitions Basis of Presentation and Consolidation and Certain Definitions Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Recent Accounting Developments Recent Accounting Developments Accounting Standards Update and Change in Accounting Principle [Text Block] Earnings per Common Share Earnings per Common Share Earnings Per Share [Text Block] Investment Securities Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Loans, Allowance for Credit Losses, Credit Quality and Off-Balance Sheet Credit Exposures Loans, Allowance for Credit Losses, Credit Quality and Off-Balance Sheet Credit Exposures Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Loan Servicing Loan Servicing [Loan Servicing] Fair Value Fair Value Fair Value Disclosures [Text Block] Legal Proceedings Legal Proceedings Legal Matters and Contingencies [Text Block] Subsequent Events Subsequent Events Subsequent Events [Text Block] Basis of presentation and consolidation Schedule of the definitions, acronyms and abbreviations identified Schedule of earnings per common share Schedule of available for sale debt securities Schedule of investments pledged for collateral Schedule of maturities of debt securities Schedule of unrealized loss on debt securities Schedule of composition of net loans Schedule of credit loss expense Schedule of activity in the allowance of credit losses on loans Schedule of risk ratings portfolio segment Schedule of gross charge offs Schedule Of amortized cost basis of loans on non accrual status and loans Schedule of past due loans by segment Schedule of amortized cost basis of collateral-dependent loans Schedule of amortized cost basis of loans Schedule of financial effect of the loan modifications Schedule of performance of modified loans Schedule of mortgage servicing rights Schedule of fair value assets and liabilities measured on a recurring basis Schedule of fair value assets and liabilities measured on a non-recurring basis Schedule of estimated fair values of financial instruments Less: dividends to preferred shareholders Net income available to common shareholders Weighted average number of common shares used in calculating earnings per share Earnings per common share [Earnings Per Share, Basic] Financial Instrument Axis Title of Individual [Axis] Guaranteed Insurance Contract Type Of Guarantee Axis Other investment [Member] U.S. GSE Debt Securities U.S. Government securities Taxable municipal securities Tax-exempt municipal securities Agency mortgage-backed securities (Agency MBS) [Member] ABS and OAS [Member] CMO [Member] Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value [Debt Securities, Available-for-Sale] Debt Instrument Axis Collateral Held [Axis] U.S. GSE debt securities, Agency MBS, ABS and OAS, CMO and CDs [Member] Collateral Pledged [Member] Amortized Cost [Amortized Cost] Fair Value [Securities Sold under Agreements to Repurchase, Fair Value of Collateral] Available for sale Securities [Member] Due in one year or less, amortized cost Due from one to five years, amortized cost Due from five to ten years, amortized cost Due after ten years, amortized cost Agency MBS, amortized cost Total, amortized cost Due in one year or less, fair value Due from one to five years, fair value Due from five to ten years, fair value Due after ten years, fair value Agency MBS, fair value Total, fair value Fair value less than 12 months Unrealized loss less than 12 months Fair value 12 months or more Unrealized loss 12 months or more Number of securities Fair value Unrealized loss CMTVAgency Mortgage Backed Securities Securities [Member] Investment Securities Exceeding 10% Shareholders' Equity [Member] AFS [Member] Book value of investment Concentration of risk percent Accrued interest receivable [Accrued Investment Income Receivable] Financing Receivable Portfolio Segment [Axis] Commercial Portfolio Segment [Member] CMTV Purchased Portfolio Segment [Member] Commercial Real Estate Portfolio Segment [Member] CMTV Municipal Portfolio Segment [Member] Residential Portfolio Segment [Member] CMTV Residential Real Estate Jr Lien Portfolio Segment [Member] Consumer Portfolio Segment [Member] Total loans Total Loans Composition of Commercial & Industrial loan Composition of Purchased loans Composition of commercial Real Estate Composition of municipal Composition of residential Real Estate - 1st Lien Composition of residential Real Estate - Jr Lien Composition of consumer Total Loan percentage Deduct (add): Allowance for loan losses [Financing Receivable, Allowance for Credit Loss, Current] Deferred net loan costs (fees) Credit loss expense - loans Credit loss reversal - OBS credit exposure Credit loss expense Commercial & Industrial [Member] Purchased Loan [Member] Commercial Real Estates [Member] Municipal [Member] Residential real estate - 1st lien [Member] Residential real estate - Jr lien [Member] Consumer [Member] ACL beginning balance [Allowance for Loan and Lease Losses, Real Estate] Charge-offs Recoveries Credit loss expense (reversal) ACL ending balance Internal Credit Assessment Axis Substandard Doubtful [Member] Commercial & industrial [Member] Pass [Member] Special mention [Member] Purchased [Member] Commercial Real Estates [Member] Substandard Doubtfuls [Member] Current Period Gross Charge Offs [Member] Residential Real Estate Jr Lien [Member] Total Loans Amount [Member] Commercial Real Estate [Member] 2026 2025 2024 2023 2022 2021 Prior Revolving loan amortized cost basis Revolving loan converted to term Total loan Residential real estate - 1st lien [Member] Residential real estate - Jr lien [Member] Nonaccrual with NO ACL 90 Days Or More And Accruing Municipal [Member] Consumer [Member] 30-89 Days 90 Days Or More Total Past Due Current Total Loans Business Assets Real Estate Total [Total] Term extension Total class of financing receivable percentage Weighted- Average Term Extension Current [Current] Past Due 90 Days or More Commercial loans Consumer loans Reserve related to nonaccrual loans Foreclosure loan amount Accrued interest receivable ACL on OBS credit exposures total amount Estimated credit losses LyndonBank [Member] Goodwill Balance At Beginning Of Year [Servicing Asset at Amortized Cost] Msrs Capitalized Msrs Amortized [Amortization of Mortgage Servicing Rights (MSRs)] Balance At end Of Year Fair Value By Fair Value Hierarchy Level Axis Fair Value Level 2 Other investment [Member] Fair Value Level 1 U.S. Government securities [U.S. Government securities] U.S. GSE debt securities Taxable municipal securities Tax-exempt municipal securities Agency MBS ABS and OAS CMO [Member] Assets: (market approach) Assets recorded at fair value on a recurring basis Fair Value Level 2 Individually analyzed loans, net of related allowance Loans held-for-sale MSRs OREO Related Party Transaction Axis Carrying Amount Fair Value Level 1 Fair Value Level 3 Fair Value [Fair Value] Cash and cash equivalents Debt securities AFS Restricted equity securities Commercial & industrial Purchased Commercial real estate Municipal Residential real estate - 1st lien Residential real estate - Jr lien Consumer MSRs (1) Other deposits Brokered deposits Overnight borrowings Short-term advances Long-term advances Repurchase agreements [Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure] Operating lease obligations Finance lease obligations Subordinated debentures Accrued interest payable Dividends declared per common share [Common Stock, Dividends, Per Share, Cash Paid]