$NKSH
NATIONAL BANKSHARES INC Stock $nksh

$nksh Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000143774922005975 Filed on March 11, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue		$44.99M
YoY Change		2.22%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$160.0K	$636.0K	$180.0K
YoY Change	-11.11%	-10.17%	-5.26%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense
YoY Change
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$6.350M	$24.63M	$5.970M
YoY Change	6.37%	28.6%	4.01%
Income Tax	$1.100M	$4.251M	$1.020M
% Of Pretax Income	17.32%	17.26%	17.09%
Net Earnings	$5.250M	$20.38M	$4.950M
YoY Change	6.06%	26.78%	3.56%
Net Earnings / Revenue		45.31%
Basic Earnings Per Share		$3.28
Diluted Earnings Per Share	$863.5K	$3.282M	$766.3K
COMMON SHARES
Basic Shares Outstanding	6.088M	6.210M	6.479M
Diluted Shares Outstanding

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$8.768M		$13.15M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$9.722M	$11.30M	$10.04M
YoY Change	-3.12%	-5.83%	12.51%
Goodwill	$5.848M		$5.848M
YoY Change	0.0%		0.0%
Intangibles
YoY Change
Long-Term Investments	$189.0M		$189.7M
YoY Change	-0.34%		3.61%
Other Assets		$300.0K
YoY Change		-120.0%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$1.702B	$1.702B	$1.520B
YoY Change	12.01%	12.01%	14.97%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$0.00	$0.00	$100.0K
YoY Change	-100.0%	-100.0%	0.0%
Accrued Expenses	$1.600M	$1.600M	$2.000M
YoY Change	-20.0%	-20.0%	-13.04%
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.600M	$1.600M	$2.100M
YoY Change	-23.81%	-23.81%	-12.5%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$14.20M	$14.20M	$19.90M
YoY Change	-28.64%	-28.64%	25.16%
Total Long-Term Liabilities	$14.20M	$14.20M	$19.90M
YoY Change	-28.64%	-28.64%	25.16%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.600M	$1.600M	$2.100M
Total Long-Term Liabilities	$14.20M	$14.20M	$19.90M
Total Liabilities	$1.510B	$1.510B	$1.319B
YoY Change	14.51%	14.5%	15.9%
SHAREHOLDERS EQUITY
Retained Earnings	$188.2M		$189.5M
YoY Change	-0.7%		2.95%
Common Stock	$7.580M		$8.040M
YoY Change	-5.72%		-0.89%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$191.8M	$191.8M	$200.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.702B	$1.702B	$1.520B
YoY Change	12.01%	12.01%	14.97%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$5.250M	$20.38M	$4.950M
YoY Change	6.06%	26.78%	3.56%
Depreciation, Depletion And Amortization	$160.0K	$636.0K	$180.0K
YoY Change	-11.11%	-10.17%	-5.26%
Cash From Operating Activities	$5.200M	$22.88M	$3.640M
YoY Change	42.86%	65.9%	-43.74%
INVESTING ACTIVITIES
Capital Expenditures	-$50.00K	$323.0K	-$190.0K
YoY Change	-73.68%	-82.29%	35.71%
Acquisitions
YoY Change
Other Investing Activities	-$64.21M	-$202.2M	-$78.08M
YoY Change	-17.76%	15.04%	36.27%
Cash From Investing Activities	-$64.26M	-$202.5M	-$78.27M
YoY Change	-17.9%	14.04%	36.26%
FINANCING ACTIVITIES
Cash Dividend Paid		$8.806M
YoY Change		-2.16%
Common Stock Issuance & Retirement, Net		$13.35M
YoY Change		675.49%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	56.09M	$175.3M	77.19M
YoY Change	-27.34%	5.17%	64.06%
NET CHANGE
Cash From Operating Activities	5.200M	$22.88M	3.640M
Cash From Investing Activities	-64.26M	-$202.5M	-78.27M
Cash From Financing Activities	56.09M	$175.3M	77.19M
Net Change In Cash	-2.970M	-$4.379M	2.560M
YoY Change	-216.02%	-253.27%	-165.31%
FREE CASH FLOW
Cash From Operating Activities	$5.200M	$22.88M	$3.640M
Capital Expenditures	-$50.00K	$323.0K	-$190.0K
Free Cash Flow	$5.250M	$22.56M	$3.830M
YoY Change	37.08%	88.48%	-42.06%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	10000000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	6063937
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	6063937
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	6432020
CY2021	dei	Auditor Firm AuditorFirmId	613
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2020Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.25
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.25
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	10000000
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	6432020
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2740000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3502000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	23000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	862000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-393000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	2000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	23000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1881000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	3063000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	3063000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.39
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	57554
CY2021	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1881000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.44
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	368083
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	pure
CY2020	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	0	pure
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	803729000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	770027000	USD
CY2020Q4	us-gaap	Assets Assets	1519673000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	481000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	1228000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	803248000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	768799000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	7674000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	8481000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	795574000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	760318000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9722000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10035000	USD
CY2021Q4	us-gaap	Interest Receivable InterestReceivable	5104000	USD
CY2021	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	pure
CY2020	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	pure
CY2020Q4	us-gaap	Interest Receivable InterestReceivable	5028000	USD
CY2021Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	957000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1553000	USD
CY2021	nksh	Period Of Restriction On Retained Net Income Without Prior Approval PeriodOfRestrictionOnRetainedNetIncomeWithoutPriorApproval	P2Y
CY2021	nksh	Potential Default Period After Sale Of Loans To Investor PotentialDefaultPeriodAfterSaleOfLoansToInvestor	P12M
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-393000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-393000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	23000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	23000	USD
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q4	us-gaap	Goodwill Goodwill	5848000	USD
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	8768000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	5848000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	5848000	USD
CY2021Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	42354000	USD
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	13147000	USD
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	130021000	USD
CY2020Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	36444000	USD
CY2021Q4	us-gaap	Other Assets OtherAssets	16287000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	17688000	USD
CY2021Q4	us-gaap	Assets Assets	1702175000	USD
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	120725000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	686080000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	546742000	USD
CY2021Q4	us-gaap	Investment Owned Restricted Cost InvestmentOwnedRestrictedCost	845000	USD
CY2020Q4	us-gaap	Investment Owned Restricted Cost InvestmentOwnedRestrictedCost	1279000	USD
CY2021Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	615000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	866000	USD
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	317430000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	276793000	USD
CY2021Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	890124000	USD
CY2020Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	763293000	USD
CY2021Q4	nksh	Deposit Savings Deposits DepositSavingsDeposits	208065000	USD
CY2020Q4	nksh	Deposit Savings Deposits DepositSavingsDeposits	167475000	USD
CY2021Q4	us-gaap	Time Deposits TimeDeposits	78968000	USD
CY2020Q4	us-gaap	Time Deposits TimeDeposits	89582000	USD
CY2021Q4	us-gaap	Deposits Deposits	1494587000	USD
CY2020Q4	us-gaap	Deposits Deposits	1297143000	USD
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	48000	USD
CY2020Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	56000	USD
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	15789000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	21867000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	1510424000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1319066000	USD
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	7580000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	8040000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	188229000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	189547000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4058000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3020000	USD
CY2021	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	6000	USD
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	108000	USD
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CY2021	us-gaap	Net Income Loss NetIncomeLoss	20382000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	191751000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	200607000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1702175000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1519673000	USD
CY2021	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	34923000	USD
CY2020	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	34523000	USD
CY2021	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	170000	USD
CY2020	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	276000	USD
CY2021	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	7960000	USD
CY2020	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	7383000	USD
CY2021	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1934000	USD
CY2020	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1826000	USD
CY2021	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	44987000	USD
CY2020	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	44008000	USD
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3098000	USD
CY2020	us-gaap	Interest Expense Deposits InterestExpenseDeposits	5837000	USD
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	41889000	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	38171000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-398000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1991000	USD
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	42287000	USD
CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	36180000	USD
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	910000	USD
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	877000	USD
CY2021	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	364000	USD
CY2020	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	676000	USD
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1261000	USD
CY2020	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1093000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	8426000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	7944000	USD
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	15747000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	14674000	USD
CY2021	us-gaap	Occupancy Net OccupancyNet	1842000	USD
CY2020	us-gaap	Occupancy Net OccupancyNet	1795000	USD
CY2021	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3039000	USD
CY2020	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3088000	USD
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	422000	USD
CY2020	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	198000	USD
CY2021	nksh	Net Costs Of Other Real Estate Owned NetCostsOfOtherRealEstateOwned	51000	USD
CY2020	nksh	Net Costs Of Other Real Estate Owned NetCostsOfOtherRealEstateOwned	39000	USD
CY2021	nksh	Tax Other TaxOther	1425000	USD
CY2020	nksh	Tax Other TaxOther	1340000	USD
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3554000	USD
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3836000	USD
CY2021	us-gaap	Noninterest Expense NoninterestExpense	26080000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	24970000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	24633000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	19154000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4251000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3077000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	20382000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	16077000	USD
CY2020	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	743000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1661000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	132000	USD
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-8000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-88000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	16077000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-10308000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	13176000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	5000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	85000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-3244000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	1478000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-9000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-87000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-7078000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	11526000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	13304000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	27603000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	183726000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	16077000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	11526000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	9000000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1722000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	200607000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	20382000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-7078000	USD
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	8806000	USD
CY2021	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	13354000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	191751000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	20382000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	16077000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-398000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1991000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	152000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	282000	USD
CY2021	us-gaap	Depreciation Depreciation	636000	USD
CY2020	us-gaap	Depreciation Depreciation	708000	USD
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1688000	USD
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1455000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-0	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2000	USD
CY2021	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	6000	USD
CY2020	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	108000	USD
CY2021	nksh	Losses And Write Downs On Other Real Estate Owned LossesAndWriteDownsOnOtherRealEstateOwned	-25000	USD
CY2020	nksh	Losses And Write Downs On Other Real Estate Owned LossesAndWriteDownsOnOtherRealEstateOwned	13000	USD
CY2021	nksh	Gain Loss On Sale Of Repossessed Assets GainLossOnSaleOfRepossessedAssets	-0	USD
CY2020	nksh	Gain Loss On Sale Of Repossessed Assets GainLossOnSaleOfRepossessedAssets	-1000	USD
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	910000	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	877000	USD
CY2021	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	364000	USD
CY2020	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	676000	USD
CY2021	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	17672000	USD
CY2020	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	39647000	USD
CY2021	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	18287000	USD
CY2020	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	40362000	USD
CY2021	us-gaap	Pension Contributions PensionContributions	-0	USD
CY2020	us-gaap	Pension Contributions PensionContributions	5000000	USD
CY2021	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	76000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-515000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	203000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	22882000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	13793000	USD
CY2021	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-9296000	USD
CY2020	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-43844000	USD
CY2021	nksh	Proceeds From Repayments Of Mortgagebacked Securities ProceedsFromRepaymentsOfMortgagebackedSecurities	44881000	USD
CY2020	nksh	Proceeds From Repayments Of Mortgagebacked Securities ProceedsFromRepaymentsOfMortgagebackedSecurities	18068000	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	20377000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	126840000	USD
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	219331000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	241164000	USD
CY2021	us-gaap	Increase Decrease Of Restricted Investments IncreaseDecreaseOfRestrictedInvestments	-434000	USD
CY2020	us-gaap	Increase Decrease Of Restricted Investments IncreaseDecreaseOfRestrictedInvestments	59000	USD
CY2021	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	25167000	USD
CY2020	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	11404000	USD
CY2021	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	15191000	USD
CY2020	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	207000	USD
CY2021	nksh	Proceeds From Loans And Leases Originations And Principal Collections ProceedsFromLoansAndLeasesOriginationsAndPrincipalCollections	-25289000	USD
CY2020	nksh	Proceeds From Loans And Leases Originations And Principal Collections ProceedsFromLoansAndLeasesOriginationsAndPrincipalCollections	-24875000	USD
CY2021	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	621000	USD
CY2020	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	72000	USD
CY2021	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	11000	USD
CY2020	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	30000	USD
CY2021	us-gaap	Proceeds From Recoveries Of Loan Previously Charged Off ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	346000	USD
CY2020	us-gaap	Proceeds From Recoveries Of Loan Previously Charged Off ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	347000	USD
CY2021	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	5000000	USD
CY2020	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	-0	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	323000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1824000	USD
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-202545000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-177604000	USD
CY2021	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-10614000	USD
CY2020	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-38446000	USD
CY2021	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	208058000	USD
CY2020	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	215836000	USD
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	8806000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	9000000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	13354000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1722000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	175284000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	166668000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4379000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2857000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	13147000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	10290000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	8768000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	13147000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	3106000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	5925000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3180000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3860000	USD
CY2021	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	755000	USD
CY2020	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	720000	USD
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	50000	USD
CY2020	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	USD
CY2021	nksh	Loans Transferred To Repossessed Assets LoansTransferredToRepossessedAssets	11000	USD
CY2020	nksh	Loans Transferred To Repossessed Assets LoansTransferredToRepossessedAssets	4000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-13054000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	16570000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	4095000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-1981000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	24000	USD
CY2020	nksh	Number Of Days Past Due NumberOfDaysPastDue	P30D
CY2021	nksh	Number Of Days Of Delinquent Loans Nonaccrual Of Interest NumberOfDaysOfDelinquentLoansNonaccrualOfInterest	P90Y
CY2021	nksh	Minimum Number Of Days Consumer Loans Are Past Due For Losses To Be Charged Off MinimumNumberOfDaysConsumerLoansArePastDueForLossesToBeChargedOff	P120D
CY2021	nksh	Maximum Number Of Days Consumer Loans Are Past Due For Losses To Be Charged Off MaximumNumberOfDaysConsumerLoansArePastDueForLossesToBeChargedOff	P180D
CY2021	nksh	Number Of Days Loans Secured By Residential Or Commercial Real Estate Are Past Due For Losses To Be Carged Off NumberOfDaysLoansSecuredByResidentialOrCommercialRealEstateArePastDueForLossesToBeCargedOff	P180D
CY2020Q4	nksh	Continuous Unrealized Loss Position Less Than Twelve Months Fair Value ContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	69967000	USD
CY2020Q4	nksh	Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses ContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	498000	USD
CY2020Q4	nksh	Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value ContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	4695000	USD
CY2021	nksh	Period Of Time Between Issuance Of Loan Commitment And Closing And Sale Of Loans Lower Range PeriodOfTimeBetweenIssuanceOfLoanCommitmentAndClosingAndSaleOfLoansLowerRange	P30D
CY2021	nksh	Period Of Time Between Issuance Of Loan Commitments And Closing And Sale Of Loans Upper Range PeriodOfTimeBetweenIssuanceOfLoanCommitmentsAndClosingAndSaleOfLoansUpperRange	P60D
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q4	nksh	Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses ContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	5000	USD
CY2021Q4	nksh	Number Of Temporarily Impaired Securities NumberOfTemporarilyImpairedSecurities	291	pure
CY2021Q4	nksh	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	318413000	USD
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	6209929
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	6483230
CY2021	us-gaap	Advertising Expense AdvertisingExpense	112000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	99000	USD
CY2021Q4	nksh	Continuous Unrealized Loss Position Aggregate Losses ContinuousUnrealizedLossPositionAggregateLosses	7067000	USD
CY2021Q4	nksh	Number Of Temporarily Impaired Securities Greater Than Twelve Months NumberOfTemporarilyImpairedSecuritiesGreaterThanTwelveMonths	48	pure
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b>Use of Estimates</b></p> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 18pt;">In preparing consolidated financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, evaluation of impairment of goodwill, and pension obligations.</p> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 18pt;"> </p>
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b>Reclassifications</b></p> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 18pt;">Certain amounts reported in prior years have been reclassified to conform to the current year’s presentation. These reclassifications had <em style="font: inherit;">no</em> effect on the Company’s net income of stockholders' equity.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2021Q4	nksh	Number Of Loan Modifications For Covid19 Related Accommodations NumberOfLoanModificationsForCOVID19RelatedAccommodations	0	pure
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	682467000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	10680000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	7067000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	686080000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	530075000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	17170000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	503000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	546742000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	2519000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	2540000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	24034000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	24051000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	313966000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	313288000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	341948000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	346201000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	682467000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	686080000	USD
CY2021Q4	nksh	Continuous Unrealized Loss Position Less Than Twelve Months Fair Value ContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	266414000	USD
CY2021Q4	nksh	Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses ContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	4922000	USD
CY2021Q4	nksh	Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value ContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	51999000	USD
CY2021Q4	nksh	Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses ContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	2145000	USD
CY2021Q4	nksh	Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value ContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	51999000	USD
CY2021Q4	nksh	Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses ContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	2145000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	287023000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	251048000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	108000	USD
CY2021	nksh	Proceeds From Calls Of Availableforsale Securities ProceedsFromCallsOfAvailableforsaleSecurities	20377000	USD
CY2021Q4	nksh	Availableforsale Securities Called AvailableforsaleSecuritiesCalled	20371000	USD
CY2021	nksh	Availableforsale Securities Gross Realized Gain Called AvailableforsaleSecuritiesGrossRealizedGainCalled	6000	USD
CY2021	nksh	Availableforsale Securities Gross Realized Loss Called AvailableforsaleSecuritiesGrossRealizedLossCalled	0	USD
CY2021	nksh	Availableforsale Securities Gross Realized Gain Loss Called AvailableforsaleSecuritiesGrossRealizedGainLossCalled	6000	USD
CY2020	nksh	Proceeds From Calls Of Availableforsale Securities ProceedsFromCallsOfAvailableforsaleSecurities	126840000	USD
CY2020Q4	nksh	Availableforsale Securities Called AvailableforsaleSecuritiesCalled	126732000	USD
CY2020	nksh	Availableforsale Securities Gross Realized Gain Called AvailableforsaleSecuritiesGrossRealizedGainCalled	110000	USD
CY2020	nksh	Availableforsale Securities Gross Realized Loss Called AvailableforsaleSecuritiesGrossRealizedLossCalled	2000	USD
CY2020	nksh	Availableforsale Securities Gross Realized Gain Loss Called AvailableforsaleSecuritiesGrossRealizedGainLossCalled	108000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	14822000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	15403000	USD
CY2021	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	2570000	USD
CY2021	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	3151000	USD
CY2020	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	10649000	USD
CY2020	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	10248000	USD
CY2021Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	14460000	USD
CY2020Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	16140000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	8481000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	755000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	346000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-398000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	7674000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	6863000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	720000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	347000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1991000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	8481000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	0	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	7674000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	7674000	USD
CY2021Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	5878000	USD
CY2021Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	797851000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	803729000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	75000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	8406000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	8481000	USD
CY2020Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	4903000	USD
CY2020Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	765124000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	770027000	USD
CY2021	nksh	Ratio Of Allowance For Loan Losses To End Of Period Loans RatioOfAllowanceForLoanLossesToEndOfPeriodLoans	0.0096	pure
CY2020	nksh	Ratio Of Allowance For Loan Losses To End Of Period Loans RatioOfAllowanceForLoanLossesToEndOfPeriodLoans	0.0110	pure
CY2021	nksh	Ratio Of Net Chargeoffs To Average Loans RatioOfNetChargeoffsToAverageLoans	0.0005	pure
CY2020	nksh	Ratio Of Net Chargeoffs To Average Loans RatioOfNetChargeoffsToAverageLoans	0.0005	pure
CY2021Q4	nksh	Loan Receivable Nonaccrual LoanReceivableNonaccrual	0	USD
CY2020Q4	nksh	Loan Receivable Nonaccrual LoanReceivableNonaccrual	846000	USD
CY2021Q4	nksh	Nonaccrual Restructured Loans NonaccrualRestructuredLoans	2873000	USD
CY2020Q4	nksh	Nonaccrual Restructured Loans NonaccrualRestructuredLoans	2839000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	2873000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	3685000	USD
CY2021Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	957000	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1553000	USD
CY2021Q4	nksh	Nonperforming Assets NonperformingAssets	3830000	USD
CY2020Q4	nksh	Nonperforming Assets NonperformingAssets	5238000	USD
CY2021Q4	nksh	Assets Ratio Of Nonperforming Assets To Loans Net Of Unearned Income And Deferred Fees Plus Oreo AssetsRatioOfNonperformingAssetsToLoansNetOfUnearnedIncomeAndDeferredFeesPlusOreo	0.0048	pure
CY2020Q4	nksh	Assets Ratio Of Nonperforming Assets To Loans Net Of Unearned Income And Deferred Fees Plus Oreo AssetsRatioOfNonperformingAssetsToLoansNetOfUnearnedIncomeAndDeferredFeesPlusOreo	0.0068	pure
CY2021Q4	nksh	Ratio Of Allowance For Loan Losses To Nonperforming Loans RatioOfAllowanceForLoanLossesToNonperformingLoans	2.6711	pure
CY2020Q4	nksh	Ratio Of Allowance For Loan Losses To Nonperforming Loans RatioOfAllowanceForLoanLossesToNonperformingLoans	2.3015	pure
CY2021Q4	us-gaap	Financing Receivable Threshold Period Past Due FinancingReceivableThresholdPeriodPastDue	P90D
CY2021Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	62000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	90000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	17000	USD
CY2021Q4	nksh	Ratio Of Loans Past Due90 Days Or More And Still Accruing To Loans RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans	0.0001	pure
CY2020Q4	nksh	Ratio Of Loans Past Due90 Days Or More And Still Accruing To Loans RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans	0.0000	pure
CY2021Q4	nksh	Accruing Restructured Loans AccruingRestructuredLoans	3005000	USD
CY2020Q4	nksh	Accruing Restructured Loans AccruingRestructuredLoans	1410000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	5878000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	3858000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	0	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1045000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	5878000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	4903000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	-0	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	75000	USD
CY2021Q4	nksh	Impaired Loans Net Of Allowance ImpairedLoansNetOfAllowance	5878000	USD
CY2020Q4	nksh	Impaired Loans Net Of Allowance ImpairedLoansNetOfAllowance	4828000	USD
CY2021	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	5901000	USD
CY2020	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	5093000	USD
CY2021	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	137000	USD
CY2020	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	54000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	6478000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	5878000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	5878000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	0	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	0	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	5453000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	4903000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	3858000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1045000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	75000	USD
CY2021	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	5901000	USD
CY2021	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	137000	USD
CY2020	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	5093000	USD
CY2020	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	54000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	90000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	2873000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	17000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	3685000	USD
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	5878000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	21752000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	4249000	USD
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	pure
CY2021	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	2826000	USD
CY2021	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2826000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	21429000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12030000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	11394000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9722000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10035000	USD
CY2021	us-gaap	Depreciation Depreciation	636000	USD
CY2020	us-gaap	Depreciation Depreciation	708000	USD
CY2021Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	14600000	USD
CY2020Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	13177000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	64262000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	5954000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	508000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	3195000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	5029000	USD
CY2021Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	20000	USD
CY2021Q4	us-gaap	Time Deposits TimeDeposits	78968000	USD
CY2021Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	170000	USD
CY2020Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	39000	USD
CY2021	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	1	pure
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	402000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	394000	USD
CY2021	nksh	Age Attained To Be Eligible For Esop AgeAttainedToBeEligibleForESOP	P21Y
CY2021	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	360000	USD
CY2020	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	300000	USD
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	184054
CY2021	nksh	Age Of Employees Required To Diversify Allocated Esop Shares AgeOfEmployeesRequiredToDiversifyAllocatedEsopShares	P55Y
CY2021	nksh	Years Of Plan Participation Required To Diversify Allocated Esop Shares YearsOfPlanParticipationRequiredToDiversifyAllocatedEsopShares	P10Y
CY2021	nksh	Percentage Of Allocated Esop Shares That Can Be Diversified PercentageOfAllocatedEsopSharesThatCanBeDiversified	0.50	pure
CY2021Q4	nksh	Accrued Expenses For Salary Continuation Plan AccruedExpensesForSalaryContinuationPlan	296000	USD
CY2020Q4	nksh	Accrued Expenses For Salary Continuation Plan AccruedExpensesForSalaryContinuationPlan	304000	USD
CY2021Q4	nksh	Liability Asset Defined Benefit Pension Plan LiabilityAssetDefinedBenefitPensionPlan	875000	USD
CY2020Q4	nksh	Liability Asset Defined Benefit Pension Plan LiabilityAssetDefinedBenefitPensionPlan	-2437000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	4106000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-1871000	USD
CY2021	nksh	Other Comprehensive Income Loss Deferred Income Tax Expense Benefit OtherComprehensiveIncomeLossDeferredIncomeTaxExpenseBenefit	860000	USD
CY2020	nksh	Other Comprehensive Income Loss Deferred Income Tax Expense Benefit OtherComprehensiveIncomeLossDeferredIncomeTaxExpenseBenefit	-416000	USD
CY2021	nksh	Defined Benefit Plan Benefit Obligation Actuarial Gain Loss Due To Demographic Changes DefinedBenefitPlanBenefitObligationActuarialGainLossDueToDemographicChanges	-764000	USD
CY2021	nksh	Defined Benefit Plan Benefit Obligation Actuarial Gain Loss Due To Change In Mortality DefinedBenefitPlanBenefitObligationActuarialGainLossDueToChangeInMortality	-40000	USD
CY2021	nksh	Defined Benefit Plan Benefit Obligation Actuarial Gain Loss Due To Change In Discount Rate DefinedBenefitPlanBenefitObligationActuarialGainLossDueToChangeInDiscountRate	1590000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	36187000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	32415000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	6049000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	984000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	1649000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	830000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	2093000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	11352000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4099000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2795000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	152000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	282000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4251000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3077000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	5173000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4021000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	763000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	798000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	25000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	62000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-184000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-208000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4251000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3077000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	1774000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	1938000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	186000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	188000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	1837000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	2697000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	899000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	866000	USD
CY2021Q4	nksh	Deferred Tax Assets Leases DeferredTaxAssetsLeases	327000	USD
CY2020Q4	nksh	Deferred Tax Assets Leases DeferredTaxAssetsLeases	423000	USD
CY2021Q4	nksh	Deferred Tax Assets Sba Fees DeferredTaxAssetsSBAFees	9000	USD
CY2020Q4	nksh	Deferred Tax Assets Sba Fees DeferredTaxAssetsSBAFees	191000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	5032000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	6303000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	415000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	424000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	1228000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	1228000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	394000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1726000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	168000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	2021000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	2186000	USD
CY2021Q4	nksh	Deferred Tax Liabilities Unrealized Gains On Available For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities	759000	USD
CY2020Q4	nksh	Deferred Tax Liabilities Unrealized Gains On Available For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities	3500000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	321000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	419000	USD
CY2021Q4	nksh	Deferred Tax Liabilities Discount Accretion Of Securities DeferredTaxLiabilitiesDiscountAccretionOfSecurities	27000	USD
CY2020Q4	nksh	Deferred Tax Liabilities Discount Accretion Of Securities DeferredTaxLiabilitiesDiscountAccretionOfSecurities	15000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4771000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	7772000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	261000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1469000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2021Q4	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	14508000	USD
CY2020	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	22000000	USD
CY2021Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments Without Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval	0	USD
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	189027000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	189667000	USD
CY2021	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	17672000	USD
CY2021	us-gaap	Mortgage Loans On Real Estate Cost Of Mortgages Sold MortgageLoansOnRealEstateCostOfMortgagesSold	18287000	USD
CY2020	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	39647000	USD
CY2020	us-gaap	Mortgage Loans On Real Estate Cost Of Mortgages Sold MortgageLoansOnRealEstateCostOfMortgagesSold	40362000	USD
CY2021Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	615000	USD
CY2021Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	28000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	686080000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	546742000	USD
CY2020Q4	nksh	Impaired Loans Net Fair Value Disclosure ImpairedLoansNetFairValueDisclosure	970000	USD
CY2021Q4	nksh	Impaired Loans Net Fair Value Disclosure ImpairedLoansNetFairValueDisclosure	957000	USD
CY2020Q4	nksh	Other Real Estate Fair Value Disclosure OtherRealEstateFairValueDisclosure	1553000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	5848000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6653000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5654000	USD
CY2021	nksh	Revenue From Contract With Customer Including Assessed Tax Outside Of Topic606 RevenueFromContractWithCustomerIncludingAssessedTaxOutsideOfTopic606	1773000	USD
CY2020	nksh	Revenue From Contract With Customer Including Assessed Tax Outside Of Topic606 RevenueFromContractWithCustomerIncludingAssessedTaxOutsideOfTopic606	2290000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	8426000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	7944000	USD
CY2021	nksh	Lessee Operating Lease Early Termination Fee LesseeOperatingLeaseEarlyTerminationFee	150000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y3M29D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y9M21D
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0321	pure
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0304	pure
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	368000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	368000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2000	USD
CY2021	us-gaap	Lease Cost LeaseCost	370000	USD
CY2020	us-gaap	Lease Cost LeaseCost	370000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	362000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	360000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	24000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	293000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	291000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	293000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	244000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	211000	USD

Files In Submission

Name	View Source	Status
0001437749-22-005975-index-headers.html	Edgar Link	pending
0001437749-22-005975-index.html	Edgar Link	pending
0001437749-22-005975.txt	Edgar Link	pending
0001437749-22-005975-xbrl.zip	Edgar Link	pending
ex_340337.htm	Edgar Link	pending
ex_340338.htm	Edgar Link	pending
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ex_340340.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
logo.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nksh-20211231.xsd	Edgar Link	pending
nksh-20211231_cal.xml	Edgar Link	unprocessable
nksh-20211231_def.xml	Edgar Link	unprocessable
nksh-20211231_lab.xml	Edgar Link	unprocessable
nksh-20211231_pre.xml	Edgar Link	unprocessable
nksh20211231_10k.htm	Edgar Link	pending
nksh20211231_10k_htm.xml	Edgar Link	completed
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$NKSH
NATIONAL BANKSHARES INC Stock $nksh

2021 Q4 Form 10-K Financial Statement

#000143774922005975 Filed on March 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NKSH NATIONAL BANKSHARES INC Stock $nksh

2021 Q4 Form 10-K Financial Statement

#000143774922005975 Filed on March 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NKSH
NATIONAL BANKSHARES INC Stock $nksh