75000 - Document - Document And Entity Information
link:presentationLink
link:calculationLink
link:definitionLink
75010 - Statement - Consolidated Balance Sheets
link:presentationLink
link:calculationLink
link:definitionLink
75020 - Statement - Consolidated Balance Sheets (Parentheticals)
link:presentationLink
link:calculationLink
link:definitionLink
75030 - Statement - Consolidated Statements of Income (Unaudited)
link:presentationLink
link:calculationLink
link:definitionLink
75040 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)
link:presentationLink
link:calculationLink
link:definitionLink
75050 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals)
link:presentationLink
link:calculationLink
link:definitionLink
75060 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Unaudited)
link:presentationLink
link:calculationLink
link:definitionLink
75070 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals)
link:presentationLink
link:calculationLink
link:definitionLink
75080 - Statement - Consolidated Statements of Cash Flows (Unaudited)
link:presentationLink
link:calculationLink
link:definitionLink
995455 - Disclosure - Note 1 - General and Summary of Significant Accounting Policies
link:presentationLink
link:calculationLink
link:definitionLink
995465 - Disclosure - Note 2 - Loans and Allowance for Credit Losses
link:presentationLink
link:calculationLink
link:definitionLink
995475 - Disclosure - Note 3 - Securities
link:presentationLink
link:calculationLink
link:definitionLink
995485 - Disclosure - Note 4 - Defined Benefit Plan
link:presentationLink
link:calculationLink
link:definitionLink
995495 - Disclosure - Note 5 - Fair Value Measurements
link:presentationLink
link:calculationLink
link:definitionLink
995505 - Disclosure - Note 6 - Components of Accumulated Other Comprehensive Loss
link:presentationLink
link:calculationLink
link:definitionLink
995515 - Disclosure - Note 7 - Revenue Recognition
link:presentationLink
link:calculationLink
link:definitionLink
995525 - Disclosure - Note 8 - Leases
link:presentationLink
link:calculationLink
link:definitionLink
995535 - Disclosure - Note 9 - Stock Based Compensation
link:presentationLink
link:calculationLink
link:definitionLink
995545 - Disclosure - Note 10 - Net Income Per Common Share
link:presentationLink
link:calculationLink
link:definitionLink
995555 - Disclosure - Note 11 - Goodwill and Other Intangibles
link:presentationLink
link:calculationLink
link:definitionLink
995565 - Disclosure - Note 13 - Borrowings
link:presentationLink
link:calculationLink
link:definitionLink
995575 - Disclosure - Note 2 - Loans and Allowance for Credit Losses (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995585 - Disclosure - Note 3 - Securities (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995595 - Disclosure - Note 4 - Defined Benefit Plan (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995605 - Disclosure - Note 5 - Fair Value Measurements (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995615 - Disclosure - Note 6 - Components of Accumulated Other Comprehensive Loss (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995625 - Disclosure - Note 7 - Revenue Recognition (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995635 - Disclosure - Note 8 - Leases (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995645 - Disclosure - Note 9 - Stock Based Compensation (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995655 - Disclosure - Note 10 - Net Income Per Common Share (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995665 - Disclosure - Note 11 - Goodwill and Other Intangibles (Tables)
link:presentationLink
link:calculationLink
link:definitionLink
995675 - Disclosure - Note 2 - Loans and Allowance for Credit Losses (Details Textual)
link:presentationLink
link:calculationLink
link:definitionLink
995685 - Disclosure - Note 2 - Loans and Allowance for Credit Losses - Past Due and Nonaccrual Loans (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995695 - Disclosure - Note 2 - Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995705 - Disclosure - Note 2 - Loans and Allowance for Credit Losses - Loans and Allowance for Loan Losses by Evaluation Method (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995715 - Disclosure - Note 2 - Loans and Allowance for Credit Losses - Details of the Collateral Dependent Loan (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995725 - Disclosure - Note 2 - Loans and Allowance for Credit Losses - Loans by Credit Quality Indicators (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995735 - Disclosure - Note 2 - Loans and Allowance for Credit Losses - Financing Receivable, Troubled Debt Restructurings (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995745 - Disclosure - Note 2 - Loans and Allowance for Credit Losses - Allowance for Credit Losses on Unfunded Commitments (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995755 - Disclosure - Note 3 - Securities - Securities Available-for-sale (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995765 - Disclosure - Note 3 - Securities - Securities in a Continuous Loss Position (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995775 - Disclosure - Note 3 - Securities (Details Textual)
link:presentationLink
link:calculationLink
link:definitionLink
995785 - Disclosure - Note 3 - Securities - Securities by Contractual Maturity (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995795 - Disclosure - Note 3 - Securities - Realized Gains and Losses From Calls of Securities (Details
link:presentationLink
link:calculationLink
link:definitionLink
995805 - Disclosure - Note 4 - Defined Benefit Plan - Defined Benefit Plan Activity (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995815 - Disclosure - Note 5 - Fair Value Measurements (Details Textual)
link:presentationLink
link:calculationLink
link:definitionLink
995825 - Disclosure - Note 5 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995835 - Disclosure - Note 5 - Fair Value Measurements - Financial Instruments (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995845 - Disclosure - Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995855 - Disclosure - Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals)
link:presentationLink
link:calculationLink
link:definitionLink
995865 - Disclosure - Note 7 - Revenue Recognition - Noninterest Income (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995875 - Disclosure - Note 8 - Leases - Lease Information and Expenses (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995885 - Disclosure - Note 8 - Leases - Lease Liability Maturity Schedule (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995895 - Disclosure - Note 8 - Leases - Lease Liability Maturity Schedule (Details) 2
link:presentationLink
link:calculationLink
link:definitionLink
995905 - Disclosure - Note 9 - Stock Based Compensation (Details Textual)
link:presentationLink
link:calculationLink
link:definitionLink
995915 - Disclosure - Note 9 - Stock Based Compensation - Summary of Nonvested Shares (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995925 - Disclosure - Note 10 - Net Income Per Common Share - Schedule of Earnings Per Share (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995935 - Disclosure - Note 11 - Goodwill and Other Intangibles (Details Textual)
link:presentationLink
link:calculationLink
link:definitionLink
995945 - Disclosure - Note 11 - Goodwill and Other Intangibles - Components of Goodwill and Other Intangible Assets (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995955 - Disclosure - Note 11 - Goodwill and Other Intangibles - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)
link:presentationLink
link:calculationLink
link:definitionLink
995965 - Disclosure - Note 13 - Borrowings (Details Textual)
link:presentationLink
link:calculationLink
link:definitionLink
Line of Credit Facility [Line Items]
Loss on sale of securities, net
Debt Securities, Available-for-Sale, Gain (Loss), Total
Debt Securities, Available-for-Sale, Gain (Loss)
Book value of available-for-sale securities that were called during the period.
Available for sale, book value
Sale of Available for Sale Securities, book value
Originated current year, write offs
us-gaap_FinancingReceivableYearOneOriginatedCurrentFiscalYearWriteoff
Federal Home Loan Bank of Atlanta [Member]
Federal Home Loan Bank of Atlanta [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financial Asset, Not Past Due [Member]
Temporarily impaired securities, 12 months or more unrealized loss
Preferred stock, shares issued (in shares)
Borrowings
Debt Disclosure [Text Block]
Lease liability
Lease liability
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Note 5 - Fair Value Measurements
Mortgage loans held for sale
us-gaap_LoansHeldForSaleFairValueDisclosure
Commitments and contingencies
Commitments and contingencies
Commitments and contingencies, Total
Weighted average number of common shares outstanding, fully diluted (in shares)
Weighted average number of common shares outstanding, diluted
Common shares weighted average outstanding, fully diluted (in shares)
Revolving, write offs
Insurance and Investment [Member]
Refers to information regarding insurance and investment.
Federal Home Loan Bank Branch [Domain]
Preferred stock, shares outstanding (in shares)
Financing Receivable, Current, Allowance for Credit Loss [Table Text Block]
Loan originations and principal collections, net
us-gaap_PaymentsForProceedsFromOtherLoansAndLeases
Common stock, shares issued (in shares)
Income tax expense
Fair value, due after one year through five years, available for sale securities
Class of Financing Receivable [Axis]
Class of Financing Receivable, Type of Borrower [Domain]
Intangible Asset, Finite-Lived, Class [Domain]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Line of Credit Facility, Maximum Borrowing Capacity
Line of Credit Facility, Maximum Borrowing Capacity
Notes Tables
us-gaap_TableTextBlock
Cash acquired in the acquisition, net of cash paid
Cash acquired in the acquisition, net of cash paid
Amortized cost, total securities available for sale
Securities available-for-sale, amortized costs
Less: discount
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
FCB acquisition
Amount of increase in allowance for credit loss on financing receivable from loan acquired from business combination or acquisition.
Product and Service, Other [Member]
Income Statement [Abstract]
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax, Total
Unrealized holding gain on securities available for sale
Comprehensive Income (Loss) Note [Text Block]
Loan Restructuring Modification [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Forfeited, shares (in shares)
Forfeited, shares (in shares)
Restricted Investments
Lease, Cost [Table Text Block]
Commercial Real Estate, Owner Occupied [Member]
Number of financing receivables that have been modified by troubled debt restructurings.
Intangible Asset, Finite-Lived [Table]
Basic net income per common share (in dollars per share)
Basic net income per common share (in dollars per share)
Basic net income per common share
Document Period End Date
2025
2026
Document Information [Table]
Other operating expenses
Total amortizing core deposit intangible
us-gaap_FiniteLivedIntangibleAssetsNet
Common stock, shares authorized (in shares)
2027
2028
Statement of Stockholders' Equity [Abstract]
Net change in other deposits
Loans, net of unearned income and deferred fees and costs
Total Loans
Commercial real estate loans totaling
Assets, Fair Value Adjustment
us-gaap_AssetsFairValueAdjustment
Maximum Loan amount indicated as risk graded
Maximum loan amount indicated as risk graded.
Maximum Loan amount indicated as risk graded
Interest on securities – taxable
Other comprehensive income (loss), net of tax
Other comprehensive income, net of tax
Other comprehensive income, net of tax
Conversion Expense
Conversion expense.
Core system conversion expense
Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Credit Card Receivable [Member]
Supplemental Cash Flow Elements [Abstract]
Cash payments for:
Total assets
us-gaap_Assets
Title of 12(b) Security
Net change in restricted stock
us-gaap_IncreaseDecreaseOfRestrictedInvestments
Goodwill, net
Goodwill
Goodwill
Goodwill, Total
Goodwill
Preferred stock, no par value, 5,000,000 shares authorized; none issued and outstanding
Proceeds from Sale of Productive Assets
Proceeds from Sale of Productive Assets, Total
Proceeds from sale of premises and equipment
Nonvested, shares (in shares)
Nonvested, shares (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Savings deposits
Savings deposits
Cash paid for amounts included in lease liabilities
Note To Financial Statement Details Textual
Federal Reserve Loan [Member]
Federal Reserve Loan.
Federal Reserve Discount Window [Member]
Interest Paid, Excluding Capitalized Interest, Operating Activity
Interest on deposits and borrowings
Goodwill [Line Items]
Restricted Stock Award [Member]
Represents restricted stock award.
Core deposit intangible, gross
Core deposit intangible
Bank-owned life insurance
Bank-owned life insurance ("BOLI")
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
Twelve months ending June 30, 2027
Lease liabilities arising from obtaining right-of-use assets during the period
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Total interest expense
us-gaap_InterestExpenseOperating
Disaggregation of Revenue [Table Text Block]
Note 7 - Revenue Recognition - Noninterest Income (Details)
BOLI income
Interest on securities – nontaxable
Lessee, Operating Leases [Text Block]
Note 9 - Leases
2029
2030
Payments to Acquire Debt Securities, Available-for-Sale
Purchases of available for sale securities
Federal Home Loan Bank Branch [Axis]
Total stockholders' equity
Balance
Balance
us-gaap_StockholdersEquity
Accrued interest payable
us-gaap_IncreaseDecreaseInInterestPayableNet
Commercial Real Estate Other [Member]
Represents commercial real estate other.
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total
Fair Value, by Balance Sheet Grouping [Table Text Block]
Earnings Per Share [Text Block]
Estimate of Fair Value Measurement [Member]
Fair value, due in one year or less, available for sale securities
Loans, collectively evaluated
Thereafter
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Goodwill and Core Deposit Intangible Assets [Line Items]
Goodwill and core deposit intangible assets.
Securities available-for-sale, gross unrealized gains
Net change in time deposits
Financial Asset, Aging [Domain]
Accretion of fair value of acquired loans
Accretion of fair value of acquired loans.
Accretion of fair value of acquired loans
Type of Borrower [Axis]
Restricted Stock [Member]
Schedule of Nonvested Share Activity [Table Text Block]
Vested and released, weighted average grant date fair value (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Other income
2028
2029
Equity Method Investment, Realized Gain (Loss) on Disposal
Gain on sale of equity investment
Gain on sale of equity investment
Gain on sale of equity investment
Amortized cost, due in one year or less, available for sale securities
Collectively Evaluated [Member]
Represents collectively evaluated for impairment.
Debt Securities, Available-for-Sale, Unrealized Loss Position
us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Preferred stock, par value (in dollars per share)
Entity Interactive Data Current
Recovery of credit losses
Provision for (recovery of) credit losses
Recovery of credit losses
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
Twelve months ending June 30, 2030
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Gain on sale of mortgage loans held for sale
Gain on sale of mortgage loans
Gain on sale of mortgage loans held for sale
Goodwill [Table]
Common stock of $1.25 par value and additional paid in capital. Authorized 10,000,000 shares; issued and outstanding 6,370,620 (including 4,619 unvested) shares as of June 30, 2026 and 6,368,410 (including 5,039 unvested) shares as of December 31, 2025
Common stock of $1.25 par value and additional paid in capital. Authorized 10,000,000 shares; issued and outstanding 6,370,620 (including 4,619 unvested) shares as of June 30, 2026 and 6,368,410 (including 5,039 unvested) shares as of December 31, 2025
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Fair Value Assets And Liabilities Measured On Recurring Basis [Table]
Fair value assets and liabilities measured on recurring basis table.
US Government Agencies Debt Securities [Member]
Value of loans transferred to repossessed assets.
Loans transferred to repossessed assets
Loans transferred to repossessed assets
Total liabilities
us-gaap_Liabilities
Common stock, shares unvested (in shares)
Number of shares of common stock unvested.
Notes To Financial Statements [Abstract]
Notes To Financial Statements Abstract
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Product and Service [Axis]
Retained earnings
Retained earnings
us-gaap_DepositsFairValueDisclosure
Deposits
Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details)
Fair Value, Inputs, Level 3 [Member]
Core Deposits [Member]
Sale of Available for Sale Securities, gross loss
The gross realized loss on available-for-sale securities that were called during the period.
Available for sale, gross loss
Note 11 - Goodwill and Other Intangibles
Pass [Member]
Cash dividend, per share (in dollars per share)
Cash dividends of $0.73 per share
Dividends declared per common share
Core deposit intangible additional
Net change in:
Financing Receivables 30 to 89 Days Past Due [Member]
Financing receivables that are more than 29 days past due but fewer than 90 days past due.
Loans:
Restricted Stock Awards and Restricted Stock Units [Member]
Restricted Stock Awards and Restricted Stock Units.
Restricted stock, at cost
us-gaap_RestrictedInvestmentsAtFairValue
us-gaap_FinancingReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Gross Charge-Offs
Core deposit intangible, accumulated amortization
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Closed End Junior Liens [Member]
Represents residential closed-end junior liens.
Operating lease expense
The gross realized gain on available-for-sale securities that were called during the period.
Available for sale, gross gain
Sale of Available for Sale Securities, gross gain
Originated current year
us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Service cost
Service cost
Service cost
Fair Value Hierarchy and NAV [Axis]
Extended Maturity [Member]
Defined Benefit Plan [Table]
Amortized cost, due after one year through five years, available for sale securities
Corporate Debt Securities [Member]
Note 11 - Goodwill and Other Intangibles - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)
Originated three years prior, write offs
us-gaap_FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Salaries and employee benefits
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]
Securities available for sale
Fair value, total securities available for sale
Securities available for sale, at fair value
Securities available-for-sale, fair values
us-gaap_FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Originated more than five years prior, write-offs
Data processing and ATM
Data processing
Amortization of fair value of acquired time deposits and leases
Amortization of fair value of acquired time deposits and leases.
Amortization of fair value of acquired time deposits and leases
Nonvested, weighted average grant date fair value (in dollars per share)
Nonvested, weighted average grant date fair value (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Special Mention [Member]
Total liabilities and stockholders' equity
us-gaap_LiabilitiesAndStockholdersEquity
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
Twelve months ending June 30, 2028
Intangible Asset, Finite-Lived, Class [Axis]
Document Fiscal Period Focus
Noninterest Income (out-of-scope of Topic 606)
us-gaap_RevenueNotFromContractWithCustomerExcludingInterestIncome
Financing Receivable, after Allowance for Credit Loss
us-gaap_NotesReceivableNet
Loans, net
Loans, gross
Gross loans
Total loans
Loans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Nonaccruals, no allowance
Originated more than five years prior
us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Accrued interest receivable
us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Net change in cash and cash equivalents
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Note 9 - Stock Based Compensation
Entity Current Reporting Status
Interest Income
Fair Value, Inputs, Level 1 [Member]
Financial Instrument [Axis]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]
Document Transition Report
Expected return on plan assets
us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Expected return on plan assets
Accounting Standards Update [Domain]
Interest-bearing demand deposits
Interest-bearing demand deposits
Share-Based Payment Arrangement [Abstract]
Commercial real estate owner-occupied (Month)
Duration of interest only payment.
Debt, Weighted Average Interest Rate
Weighted average interest rate
Retirement Plan Type [Axis]
Restricted stock, at cost
Accounting Standards Update [Axis]
Noninterest Expense
Commercial Real Estate Portfolio Segment [Member]
Common Stock Including Additional Paid in Capital [Member]
Stockholders' Equity
Stockholders' Equity
Weighted average number of common shares outstanding, basic (in shares)
Weighted average number of common shares outstanding, basic
Common shares weighted average outstanding, basic (in shares)
Assets
Loan Restructuring Modification [Domain]
Entity Central Index Key
Gain (Loss) on Securities [Table Text Block]
Accrued interest payable
us-gaap_AccruedLiabilitiesFairValueDisclosure
Line of Credit Facility [Table]
Interest-bearing deposits
Current Fiscal Year End Date
Document Quarterly Report
Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five
2031
Net income (loss), diluted
Net income, diluted
Intangible Asset and Goodwill [Table Text Block]
Percentage
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Loss on disposal of premises and equipment, net
Fair Value, Inputs, Level 2 [Member]
Time deposits
Time deposits
Mortgage Loans in Process of Foreclosure, Amount
us-gaap_MortgageLoansInProcessOfForeclosureAmount
Net change in borrowings
Increase Decrease In Borrowings
Increase decrease in borrowings.
Net cash provided by operating activities
us-gaap_NetCashProvidedByUsedInOperatingActivities
Entity Incorporation, State or Country Code
Fully diluted net income per common share (in dollars per share)
Diluted net income per common share
Diluted net income per common share
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average discount rate
Net Income
Net income
Net Income
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Stock based compensation
Other assets
us-gaap_IncreaseDecreaseInOtherOperatingAssets
Collection of loan participations
Other comprehensive income (loss), tax
Other comprehensive income, tax
Nonaccruals
us-gaap_ComprehensiveIncomeNetOfTax
Total Comprehensive Income
Fair value, due after ten years, available for sale securities
Measurement Frequency [Domain]
Consumer Real Estate Loans.
Consumer Real Estate Loans [Member]
Other Consumer Loans [Member]
Refers to financing receivable related to other consumer loans portion of consumer non-real estate portfolio.
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Reclassificationi adjustment, net of tax
Equity Components [Axis]
Cash Flows from Investing Activities
Cash and due from banks
Statement of Cash Flows [Abstract]
Fair Value Hierarchy and NAV [Domain]
Retirement Benefits [Abstract]
Amortized cost, due after five years through ten years, available for sale securities
Temporarily impaired securities, less than 12 months unrealized loss
Core deposit intangible, net
Core deposit intangible, net
Core deposit intangible
Fair Value Disclosures [Text Block]
Franchise taxes
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Line items represent fair value assets and liabilities measured on nonrecurring basis.
Allowance for credit losses on loans
Allowance for loan losses
Balance
Balance
Related allowance
Less: allowance for credit losses on loans
Total deposits
us-gaap_Deposits
Originated two years prior
us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
Preferred stock, shares authorized (in shares)
Unrealized holding gain on available for sale securities, net of tax
Unrealized holding (loss) gain on available for sale securities net of tax of ($173) and $1,000 for the periods ended June 30, 2026 and 2025, respectively
Unrealized holding (loss) gain on available for sale securities net of tax.
Nonaccruals, with allowance
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Line items represent fair value assets and liabilities measured on recurring basis.
Financing receivable net of deferred fees and costs
Financing receivable net of deferred fees and costs.
Loans, net of deferred fees and costs
Loans, net of deferred fees and costs
AOCI Attributable to Parent [Member]
Collateralized Mortgage-Backed Securities [Member]
Interest on federal funds sold
Consumer Real Estate Portfolio Segment [Member]
Portfolio segment of the company's total financing receivables related to consumer real estate receivables.
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax
Unrealized holding gain on available for sale securities, tax
Other Comprehensive Income, Net of Tax
Total noninterest income
us-gaap_NoninterestIncome
Accrued interest receivable
Accrued interest receivable
Disaggregation of Income Statement Expense, Caption [Line Items]
Consumer Non Real Estate Portfolio Segment [Member]
Portfolio segment of the company's total financing receivables related to consumer non real estate receivables.
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals)
Interest on time deposits
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss
us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Originated five years prior
us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
Securities available-for-sale, gross unrealized losses
Dividends, Common Stock
Dividends, Common Stock, Total
Cash dividends of $0.73 per share
Cash dividends
Document Type
Defined Benefit Plan Disclosure [Line Items]
Charge-offs
Loans charged against the allowance for credit losses
Loans charged against the allowance for credit losses
Financing Receivable, Allowance for Credit Loss, Writeoff, Total
Cash Flows from Operating Activities
Liabilities and Stockholders' Equity
Cumulative Effect, Period of Adoption [Domain]
Purchases of premises and equipment
Payments to Acquire Productive Assets, Total
Payments to Acquire Productive Assets
Financing Receivable, Allowance for Credit Loss [Table Text Block]
Goodwill addition
Internal Credit Assessment [Axis]
The gross realized gain (loss) on available-for-sale securities that were called during the period.
Available for sale, net gain (loss)
Sale of Available for Sale Securities, net gain (loss)
Recoveries
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Public Sector and IDA Portfolio Segment[Member]
Portfolio segment of the company's total financing receivables related to public sector and IDA receivables.
Public Sector and IDA Portfolio Segment [Member]
Loans Held-for-sale [Member]
Information related to loans held for sale.
Originated three years prior
us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
Asset Class [Domain]
Entity File Number
Provision for (recovery of) credit losses
Provision for credit losses
Provision for credit losses
Amount of cash inflow from repayments of mortgage-backed securities.
Proceeds from repayments of mortgage-backed securities
Proceeds from repayments of mortgage-backed securities
Revenue from Contract with Customer [Text Block]
Retirement Plan Type [Domain]
Number of consumer real estate loans with amortized cost
Number of Consumer Real Estate Loan With Amortized Cost
Number of consumer real estate loan with amortized cost.
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Financing Receivable, Collateral Dependent Loan [Table Text Block]
Tabular disclosure of collateral dependent loan.
Retained Earnings [Member]
Investment in Debt and Equity Securities and Other Trading Assets [Text Block]
Debt Instrument, Term
Maturity term of debt
Deposit Account [Member]
Equity Lines [Member]
Financing receivable classified as equity lines.
Entity Registrant Name
Depreciation of premises and equipment
Interest-bearing deposits
nksh_InterestBearingDepositsFairValueDisclosure
For banks and other depository institutions (including Federal Reserve Banks, if applicable). Fair value of interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
Twelve months ending June 30, 2031
Interest on other deposits
Interest on other deposits
Individually Evaluated [Member]
Represents individually evaluated for impairment.
Entity Address, Address Line One
Note 4 - Securities
Mortgage loans held for sale
Revolving
Interest on interest-bearing deposits
Net periodic benefit income
us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Net periodic benefit income
Fair Value, Recurring and Nonrecurring [Table]
Accounting Standards Update 2016-13 [Member]
Supplemental Disclosures of Cash Flow Information
Supplemental Cash Flow Information [Abstract]
Entity Small Business
Pension Plan [Member]
Net Periodic Benefit Income [Member]
Financing Receivable Number Of Contracts Modified
Financing receivable number of contracts modified.
Number of loans modified for borrowers
Dilutive shares (in shares)
Dilutive shares for restricted stock awards: (in shares)
Net interest income
us-gaap_InterestIncomeExpenseNet
Financing receivable deferred fees and costs
Financing receivable deferred fees and costs.
Less deferred fees and costs
Forfeited, weighted average grant date fair value (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
Proceeds from calls, principal payments, sales and maturities of securities available for sale
Proceeds from calls, sales and maturities of securities available for sale
Significant Accounting Policies [Text Block]
Other assets
us-gaap_OtherAssets
The cash inflow associated with calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.
Available for sale, proceeds
Sale of Available for Sale Securities, proceeds
Earnings Per Share [Abstract]
US States and Political Subdivisions Debt Securities [Member]
Closed End First Liens [Member]
Represents residential closed-end first liens.
Intangible Asset, Finite-Lived, Estimated Amortization Expense, after Year Five
Thereafter
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
Twelve months ending June 30, 2029
Automobile Loan [Member]
Plan Name [Axis]
Financing Receivable Credit Quality Indicators [Table Text Block]
Product and Service [Domain]
Acquired Loans [Member]
Represents acquired loans.
Proceeds from sale of mortgage loans held for sale
Measurement Frequency [Axis]
Interest and fees on loans
Cash Flows from Financing Activities
Financing Receivable, Past Due [Table Text Block]
Disaggregation of Income Statement Expense, Caption [Table]
Accrued interest payable
us-gaap_InterestPayableCurrentAndNoncurrent
Total interest income
us-gaap_InterestAndDividendIncomeOperating
Entity Tax Identification Number
Collateral Pledged [Member]
Equity Component [Domain]
Entity Address, City or Town
Intangible Asset, Finite-Lived [Line Items]
Income taxes
Income Tax Paid, after Refund Received
Income Taxes Paid, Net, Total
Occupancy, furniture and fixtures
Entity Common Stock, Shares Outstanding
Investments Classified by Contractual Maturity Date [Table Text Block]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax
Reclassification adjustment for loss included in net income, net of tax.
Reclassification adjustment for loss included in net income, net of tax
Entity [Domain]
Construction, 1-4 Family Residential [Member]
Financing receivable classified as construction, 1-4 family residential.
Intangible Asset and Goodwill [Text Block]
Tabular disclosure of realized gain (loss) on called securities.
Schedule of Realized Gain (Loss) on Called Securities [Table Text Block]
amortized cost
Measurement Basis [Axis]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Table]
Fair value assets and liabilities measured on nonrecurring basis table.
Real Estate Construction Portfolio Segment[Member]
Portfolio segment of the company's total financing receivables related to real estate construction receivables.
Real Estate Construction Portfolio Segment [Member]
Statement [Table]
Debt Securities, Available-for-Sale, Realized Gain (Loss)
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total
Loss on sale of securities available for sale, net
Debt Securities, Available-for-Sale, Realized Gain (Loss)
Loss on sale of securities available for sale, net
Share-Based Payment Arrangement, Expense
us-gaap_AllocatedShareBasedCompensationExpense
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before income tax expense
Entity Shell Company
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash (used in) provided by investing activities
Statement [Line Items]
Collateral Held [Axis]
Investor Owned Residential Real Estate [Member]
Represents investor owned residential real estate.
Fiduciary and Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Construction Residential [Member]
Refers to financing receivable related to residential portion of construction portfolio.
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Vested and released, shares (in shares)
Commercial Non Real Estate Segment [Member]
Portfolio segment of the company's total financing receivables related to commercial receivables, non real estate.
Noninterest-bearing demand deposits
Noninterest-bearing demand deposits
us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Net interest income after provision for credit losses
Debt Disclosure [Abstract]
Other liabilities
us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Note 8 - Leases - Lease Information and Expenses (Details)
Financing Receivables [Text Block]
Loans 90 or more days past due and accruing
Total noninterest expense
us-gaap_NoninterestExpense
Borrowings
Long-Term Federal Home Loan Bank Advances
Long-Term Federal Home Loan Bank Advances, Total
Asset Class [Axis]
Investments, Debt and Equity Securities [Abstract]
Granted, weighted average grant date fair value (in dollars per share)
Financing Receivable Portfolio Segment [Axis]
Classified Excluding Impaired [Member]
Refers to a category of financing receivables with frequent or persistent delinquency exceeding 75 days or that have a higher level of weakness in the borrower's financial condition. Classified loans have regulatory risk ratings of "substandard" and "doubtful."
Marketable Securities [Line Items]
Loans, net
us-gaap_LoansReceivableFairValueDisclosure
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax
Net pension gain arising during the period, tax
Net pension gain arising during the period, net of taxes
Document Fiscal Year Focus
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Amortization of premiums and accretion of discounts on securities, net
Common stock, shares outstanding (in shares)
Federal funds sold
Federal funds sold
Credit and Debit Card [Member]
Bank-owned life insurance
us-gaap_CashSurrenderValueFairValueDisclosure
Financial Instruments [Domain]
Statement of Comprehensive Income [Abstract]
Stock Incentive Plan 2023 [Member]
Represents Stock Incentive Plan 2023.
Goodwill and Core Deposit Intangible Assets [Table]
Goodwill and Core Deposit Intangible Assets.
Note 11 - Goodwill and Other Intangibles - Components of Goodwill and Other Intangible Assets (Details)
Collateral Held [Domain]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged
us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Unfunded Loan Commitment [Member]
Interest Only Payments [Member]
Related to a debt restructuring stipulating that only interest payments are required for a certain period.
us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Debt Securities, Available-for-Sale, Allowance for Credit Losses
Recoveries on loans charged off
Total undiscounted cash flows
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Temporarily impaired securities, less than 12 months, fair value
Security Exchange Name
Changes Measurement [Member]
Purchase of loan participations
us-gaap_PaymentsToAcquireLoansReceivable
Financing Receivable, Accrued Interest, before Allowance for Credit Loss
us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss
Entity Address, State or Province
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Commercial Mortgage-Backed Securities [Member]
Notes to Financial Statements
us-gaap_DisclosureTextBlockAbstract
Right-of-use asset
us-gaap_OperatingLeaseRightOfUseAsset
Amendment Flag
Financial Asset, Aging [Axis]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Right-of-use assets obtained in exchange for operating lease liabilities commencing during the period
Right-of-use assets obtained in exchange for operating lease liabilities commencing during the period
Share-Based Payment Arrangement [Text Block]
Noninterest Income:
Debt Instrument [Axis]
Financing Receivable Portfolio Segment [Domain]
Note 10: Net Income Per Common Share - Schedule of Earnings Per Share (Details)
City Area Code
Internal Credit Assessment [Domain]
Reported Value Measurement [Member]
Unrealized holding gain (loss) on available for sale securities, tax
Unrealized holding gain on available for sale securities, tax
Class of Financing Receivable [Domain]
National Bank of Blacksburg [Member]
Represents information pertaining to National Bank of Blacksburg (NBB), a wholly-owned subsidiary.
Origination of mortgage loans held for sale
us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale
Loans, individually evaluated
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions
us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Note 6 - Components of Accumulated Other Comprehensive Loss
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Unrealized holding gain on available for sale securities, net of tax
Debt Securities, Realized Gain (Loss)
Debt Securities, Realized Gain (Loss), Total
Proceeds from sale of equity investment
Proceeds from Sale of Equity Securities, FV-NI
Commercial and industrial (Month)
Other liabilities
us-gaap_OtherLiabilities
Retirement Benefits [Text Block]
Common stock, par value (in dollars per share)
Legal Entity [Axis]
Interest on borrowings
Interest Expense, Borrowings
Interest Expense, Borrowings, Total
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Debt Securities, Available-for-Sale [Table Text Block]
Trading Symbol
Noninterest Income (in-scope of Topic 606)
Noninterest Income
Service charges on deposit accounts
Granted, shares (in shares)
Entity Emerging Growth Company
Receivables [Abstract]
Contract termination
us-gaap_GainLossOnContractTermination
Fair Value Measurement [Domain]
Plan Name [Domain]
Construction, Other [Member]
Refers to financing receivable related to other portion of construction portfolio.
Amortized cost, due after ten years, available for sale securities
Accrued interest receivable
nksh_AccruedInterestReceivableFairValueDisclosure
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 element represents the fair value of accrued interest receivable.
Portion at Fair Value Measurement [Member] [Default]
Portion at Fair Value Measurement [Member]
Cash dividends paid
us-gaap_PaymentsOfDividends
Multifamily Real Estate [Member]
Refers to the Multi family real estate as individual assets.
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Supplemental Disclosure of Noncash Activities
Interest cost
Interest cost
Interest cost
Marketable Securities [Table]
Weighted average remaining lease term (in years) (Year)
Professional services
Accumulated other comprehensive loss, net
Accumulated other comprehensive loss, net
Intangible Asset, Including Goodwill, Impairment Loss [Abstract]
Amortization of Intangible Assets
Intangible asset amortization
Amortization of core deposit intangible
Increase in cash value of bank-owned life insurance
us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue
Acquisition of Frontier Community Bank
Stock Issued During Period, Value, Acquisitions
Equity based compensation expense
Adjustments to reconcile net income to net cash provided by operating activities:
Reclassification adjustment for gain included in net income, taxes
us-gaap_ReclassificationFromAociCurrentPeriodTax
Financing Receivable, Allowance for Credit Loss [Table]
Fair Value Disclosures [Abstract]
Total cash and cash equivalents
us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and due from banks
nksh_CashAndDueFromBanksFairValueDisclosure
For banks and other depository institutions: Includes fair value of cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.
Fair value, due after five years through ten years, available for sale securities
Reclassification adjustment for gain included in net income, tax
Reclassification adjustment for loss included in net income, tax
Accumulated Other Comprehensive Income (Loss) [Table]
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
Commercial and Industrial [Member]
Represents commercial and industrial loans.
Fair Value, Nonrecurring [Member]
Net income (loss), basic
Net income, basic
Originated five years prior, write offs
us-gaap_FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Note 8 - Leases - Lease Liability Maturity Schedule (Details)
Entity Filer Category
Debt Instrument, Name [Domain]
Revolving loans converted to term, write offs
Originated four years prior, write offs
us-gaap_FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Interest Expense
2026
2027
Premises and equipment, net
Premises and equipment, net
Temporarily impaired securities, 12 months or more fair value
Cumulative Effect, Period of Adoption [Axis]
Unallocated Financing Receivables [Member]
FDIC assessment
Document Information [Line Items]
Revolving loans converted to term
Originated four years prior
us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
Entity Address, Postal Zip Code
Statement of Financial Position [Abstract]
Local Phone Number