$NKSH
NATIONAL BANKSHARES INC Stock $nksh

$nksh Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-K Financial Statement

#000143774921006364 Filed on March 18, 2021

Income Statement

Concept	2021 Q1	2020	2019 Q4
Revenue	$10.88M	$44.01M
YoY Change	-4.44%	-2.52%
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	$164.0K	$708.0K	$190.0K
YoY Change	-6.82%	-4.19%	5.56%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$855.0K	$5.837M
YoY Change	-52.39%	-20.91%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$5.775M	$19.15M	$5.740M
YoY Change	20.79%	-7.37%	6.89%
Income Tax	$1.009M	$3.077M	$960.0K
% Of Pretax Income	17.47%	16.06%	16.72%
Net Earnings	$4.766M	$16.08M	$4.780M
YoY Change	19.78%	-7.95%	4.82%
Net Earnings / Revenue	43.8%	36.53%
Basic Earnings Per Share	$0.74	$2.48
Diluted Earnings Per Share	$0.74	$2.48	$736.5K
COMMON SHARES
Basic Shares Outstanding	6.388M	6.483M	6.490M
Diluted Shares Outstanding

Balance Sheet

Concept	2021 Q1	2020	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$12.68M		$10.29M
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	$9.955M	$12.00M	$8.919M
YoY Change	-1.02%	7.14%	3.16%
Goodwill	$5.848M		$5.848M
YoY Change	0.0%		0.0%
Intangibles
YoY Change
Long-Term Investments			$183.1M
YoY Change			-3.5%
Other Assets		-$1.500M
YoY Change		-178.95%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$1.568B	$1.520B	$1.322B
YoY Change	18.9%	14.97%	5.24%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$0.00	$100.0K	$100.0K
YoY Change	-100.0%	0.0%	0.0%
Accrued Expenses	$1.900M	$2.000M	$2.300M
YoY Change		-13.04%
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.900M	$2.100M	$2.400M
YoY Change	1800.0%	-12.5%	2300.0%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$18.60M	$19.90M	$15.90M
YoY Change	-2.62%	25.16%	15.22%
Total Long-Term Liabilities	$18.60M	$19.90M	$15.90M
YoY Change	-2.62%	25.16%	15.22%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.900M	$2.100M	$2.400M
Total Long-Term Liabilities	$18.60M	$19.90M	$15.90M
Total Liabilities	$1.379B	$1.319B	$1.138B
YoY Change	22.33%	15.9%	6.79%
SHAREHOLDERS EQUITY
Retained Earnings	$190.5M		$184.1M
YoY Change	1.26%		-4.91%
Common Stock	$7.900M		$8.112M
YoY Change	-2.61%		-6.74%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$189.1M	$200.6M	$183.7M
YoY Change
Total Liabilities & Shareholders Equity	$1.568B	$1.520B	$1.322B
YoY Change	18.9%	14.97%	5.24%

Cashflow Statement

Concept	2021 Q1	2020	2019 Q4
OPERATING ACTIVITIES
Net Income	$4.766M	$16.08M	$4.780M
YoY Change	19.78%	-7.95%	4.82%
Depreciation, Depletion And Amortization	$164.0K	$708.0K	$190.0K
YoY Change	-6.82%	-4.19%	5.56%
Cash From Operating Activities	$6.753M	$13.79M	$6.470M
YoY Change	29.54%	-26.76%	16.58%
INVESTING ACTIVITIES
Capital Expenditures	-$80.00K	$1.824M	-$140.0K
YoY Change	-93.94%	76.74%	55.56%
Acquisitions
YoY Change
Other Investing Activities	-$64.59M	-$175.8M	-$57.30M
YoY Change	-759.75%	189.83%	-1141.82%
Cash From Investing Activities	-$64.68M	-$177.6M	-$57.44M
YoY Change	-863.51%	187.95%	-1161.74%
FINANCING ACTIVITIES
Cash Dividend Paid		$9.000M
YoY Change		-0.35%
Common Stock Issuance & Retirement, Net	$3.991M	$1.722M
YoY Change		-90.7%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$57.45M	$166.7M	47.05M
YoY Change	-596.58%	314.04%	-589.09%
NET CHANGE
Cash From Operating Activities	$6.753M	$13.79M	6.470M
Cash From Investing Activities	-$64.68M	-$177.6M	-57.44M
Cash From Financing Activities	$57.45M	$166.7M	47.05M
Net Change In Cash	-$470.0K	$2.857M	-3.920M
YoY Change	-122.23%	-210.22%	-392.54%
FREE CASH FLOW
Cash From Operating Activities	$6.753M	$13.79M	$6.470M
Capital Expenditures	-$80.00K	$1.824M	-$140.0K
Free Cash Flow	$6.833M	$11.97M	$6.610M
YoY Change	4.59%	-32.76%	17.2%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.39
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	950000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	249000	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
CY2019	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
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	24000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	3063000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	950000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-635000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-635000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.21
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	6388120
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2019Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.25
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1.25
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	10000000
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	10000000
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	6432020
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	6432020
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	6489574
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	6489574
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3502000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1486000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-595000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-23000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-119000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-4000	USD
CY2018	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax	237000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	393000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	394000	USD
CY2020Q4	us-gaap	Investment Owned Restricted Cost InvestmentOwnedRestrictedCost	1279000	USD
CY2019Q4	us-gaap	Investment Owned Restricted Cost InvestmentOwnedRestrictedCost	1220000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	866000	USD
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	468400
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
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	0	pure
CY2020	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	pure
CY2019	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	300000	USD
CY2018	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	300000	USD
CY2020	nksh	Period Of Restriction On Retained Net Income Without Prior Approval PeriodOfRestrictionOnRetainedNetIncomeWithoutPriorApproval	P2Y
CY2020	nksh	Potential Default Period After Sale Of Loans To Investor PotentialDefaultPeriodAfterSaleOfLoansToInvestor	P12M
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-595000	USD
CY2018	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax	237000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	249000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	24000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	394000	USD
CY2019	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	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	23000	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
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	13147000	USD
CY2019Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	10290000	USD
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	120725000	USD
CY2019Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	76881000	USD
CY2020Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	546742000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	435263000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	905000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	770027000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	734027000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	1228000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	576000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	768799000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	733451000	USD
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CY2019Q4	us-gaap	Interest Receivable InterestReceivable	4285000	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1553000	USD
CY2019Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1612000	USD
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CY2019Q4	us-gaap	Goodwill Goodwill	5848000	USD
CY2020Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	36444000	USD
CY2019Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	35567000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	17688000	USD
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CY2020Q4	us-gaap	Assets Assets	1519673000	USD
CY2019Q4	us-gaap	Assets Assets	1321837000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	276793000	USD
CY2019Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	201866000	USD
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CY2019Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	643482000	USD
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CY2020Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	56000	USD
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CY2020Q4	us-gaap	Liabilities Liabilities	1319066000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1138111000	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	8040000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	8112000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	189547000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	184120000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3020000	USD
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CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	200607000	USD
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CY2020	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	276000	USD
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CY2018	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	672000	USD
CY2020	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	7383000	USD
CY2019	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	6725000	USD
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CY2020	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1826000	USD
CY2019	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	3030000	USD
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CY2018	us-gaap	Interest Expense InterestExpense	5047000	USD
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CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	37767000	USD
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CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1991000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	126000	USD
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CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	36180000	USD
CY2019	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	37641000	USD
CY2018	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	38258000	USD
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	877000	USD
CY2019	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	910000	USD
CY2018	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	901000	USD
CY2020	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	676000	USD
CY2019	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	297000	USD
CY2018	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	199000	USD
CY2020	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1093000	USD
CY2019	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1346000	USD
CY2018	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	806000	USD
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	108000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	566000	USD
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	17000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	7944000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	8790000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	7729000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	14674000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	14920000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	14506000	USD
CY2020	us-gaap	Occupancy Net OccupancyNet	1795000	USD
CY2019	us-gaap	Occupancy Net OccupancyNet	1866000	USD
CY2018	us-gaap	Occupancy Net OccupancyNet	1845000	USD
CY2020	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3088000	USD
CY2019	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3171000	USD
CY2018	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2784000	USD
CY2020	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	198000	USD
CY2019	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	167000	USD
CY2018	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	359000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	50000	USD
CY2020	nksh	Net Costs Of Other Real Estate Owned NetCostsOfOtherRealEstateOwned	39000	USD
CY2019	nksh	Net Costs Of Other Real Estate Owned NetCostsOfOtherRealEstateOwned	47000	USD
CY2018	nksh	Net Costs Of Other Real Estate Owned NetCostsOfOtherRealEstateOwned	553000	USD
CY2020	nksh	Tax Other TaxOther	1340000	USD
CY2019	nksh	Tax Other TaxOther	1333000	USD
CY2018	nksh	Tax Other TaxOther	1278000	USD
CY2018	nksh	Writedown Of Insurance Receivable WritedownOfInsuranceReceivable	2010000	USD
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3836000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4250000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3891000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	24970000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	25754000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	27276000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	19154000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	20677000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18711000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3077000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3211000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2560000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	16077000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	17466000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	16151000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.48
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.65
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.32
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.48
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.65
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.32
CY2020	us-gaap	Net Income Loss NetIncomeLoss	16077000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	17466000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	16151000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	13176000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	5595000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2246000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	85000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	447000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	13000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Transfers From Held To Maturity To Available For Sale Securities Net Of Tax OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	891000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-1478000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-1482000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-936000	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
CY2019	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
CY2018	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	-86000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	11526000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3579000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2390000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	27603000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21045000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	13761000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	184896000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	16151000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2390000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	8419000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	190238000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	17466000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3579000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	9032000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	18525000	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	16077000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	17466000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	16151000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1991000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	126000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-81000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	282000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	529000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-382000	USD
CY2020	us-gaap	Depreciation Depreciation	708000	USD
CY2019	us-gaap	Depreciation Depreciation	739000	USD
CY2018	us-gaap	Depreciation Depreciation	766000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	50000	USD
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1455000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-212000	USD
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-58000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-5000	USD
CY2020	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	108000	USD
CY2019	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	566000	USD
CY2018	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	17000	USD
CY2020	nksh	Losses And Write Downs On Other Real Estate Owned LossesAndWriteDownsOnOtherRealEstateOwned	13000	USD
CY2019	nksh	Losses And Write Downs On Other Real Estate Owned LossesAndWriteDownsOnOtherRealEstateOwned	-5000	USD
CY2018	nksh	Losses And Write Downs On Other Real Estate Owned LossesAndWriteDownsOnOtherRealEstateOwned	-489000	USD
CY2020	nksh	Gain Loss On Sale Of Repossessed Assets GainLossOnSaleOfRepossessedAssets	-1000	USD
CY2019	nksh	Gain Loss On Sale Of Repossessed Assets GainLossOnSaleOfRepossessedAssets	-4000	USD
CY2018	nksh	Gain Loss On Sale Of Repossessed Assets GainLossOnSaleOfRepossessedAssets	-8000	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	877000	USD
CY2019	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	910000	USD
CY2018	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	901000	USD
CY2020	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	676000	USD
CY2019	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	297000	USD
CY2018	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	199000	USD
CY2020	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	39647000	USD
CY2019	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	21032000	USD
CY2018	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	12626000	USD
CY2020	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	40362000	USD
CY2019	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	20496000	USD
CY2018	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	13013000	USD
CY2020	us-gaap	Pension Contributions PensionContributions	5000000	USD
CY2020	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	743000	USD
CY2019	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-875000	USD
CY2018	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-137000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	132000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1340000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2899000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-88000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	55000	USD
CY2018	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	27000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	203000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2465000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	404000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	13793000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	18832000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	19796000	USD
CY2020	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-43844000	USD
CY2019	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-33390000	USD
CY2018	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	7742000	USD
CY2020	nksh	Proceeds From Repayments Of Mortgagebacked Securities ProceedsFromRepaymentsOfMortgagebackedSecurities	18068000	USD
CY2019	nksh	Proceeds From Repayments Of Mortgagebacked Securities ProceedsFromRepaymentsOfMortgagebackedSecurities	1089000	USD
CY2018	nksh	Proceeds From Repayments Of Mortgagebacked Securities ProceedsFromRepaymentsOfMortgagebackedSecurities	224000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	126840000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	348032000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	50438000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	6430000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	241164000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	352505000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	25323000	USD
CY2018	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	7853000	USD
CY2020	us-gaap	Increase Decrease Of Restricted Investments IncreaseDecreaseOfRestrictedInvestments	59000	USD
CY2018	us-gaap	Increase Decrease Of Restricted Investments IncreaseDecreaseOfRestrictedInvestments	20000	USD
CY2020	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	11404000	USD
CY2019	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	673000	USD
CY2020	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	207000	USD
CY2019	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	4262000	USD
CY2018	us-gaap	Proceeds From Principal Repayments On Loans And Leases Held For Investment ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment	970000	USD
CY2020	nksh	Proceeds From Loans And Leases Originations And Principal Collections ProceedsFromLoansAndLeasesOriginationsAndPrincipalCollections	-24875000	USD
CY2019	nksh	Proceeds From Loans And Leases Originations And Principal Collections ProceedsFromLoansAndLeasesOriginationsAndPrincipalCollections	-28388000	USD
CY2018	nksh	Proceeds From Loans And Leases Originations And Principal Collections ProceedsFromLoansAndLeasesOriginationsAndPrincipalCollections	-35591000	USD
CY2020	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	72000	USD
CY2019	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	591000	USD
CY2018	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	276000	USD
CY2020	nksh	Proceeds From Sale Of Repossessed Assets ProceedsFromSaleOfRepossessedAssets	30000	USD
CY2019	nksh	Proceeds From Sale Of Repossessed Assets ProceedsFromSaleOfRepossessedAssets	53000	USD
CY2018	nksh	Proceeds From Sale Of Repossessed Assets ProceedsFromSaleOfRepossessedAssets	34000	USD
CY2020	us-gaap	Proceeds From Recoveries Of Loan Previously Charged Off ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	347000	USD
CY2019	us-gaap	Proceeds From Recoveries Of Loan Previously Charged Off ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	267000	USD
CY2018	us-gaap	Proceeds From Recoveries Of Loan Previously Charged Off ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	235000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1824000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1032000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1191000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	16000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-177604000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-61678000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3629000	USD
CY2020	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-38446000	USD
CY2019	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	26229000	USD
CY2018	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-13085000	USD
CY2020	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	215836000	USD
CY2019	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	41582000	USD
CY2018	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	5293000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	9000000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	9032000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	8419000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1722000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	18525000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	166668000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	40254000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-16211000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2857000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-2592000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-44000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	10290000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	12882000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	12926000	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
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	12882000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	5925000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	7325000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	5020000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3860000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2544000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1778000	USD
CY2020	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	720000	USD
CY2019	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	920000	USD
CY2018	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	689000	USD
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	156000	USD
CY2020	nksh	Loans Transferred To Repossessed Assets LoansTransferredToRepossessedAssets	4000	USD
CY2019	nksh	Loans Transferred To Repossessed Assets LoansTransferredToRepossessedAssets	71000	USD
CY2018	nksh	Loans Transferred To Repossessed Assets LoansTransferredToRepossessedAssets	55000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	16570000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	6515000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-2858000	USD
CY2018	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	1128000	USD
CY2018	us-gaap	Debt Securities Held To Maturity Transfer Amount DebtSecuritiesHeldToMaturityTransferAmount	119790000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-1981000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-1986000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-1295000	USD
CY2020	nksh	Noncash Increase To Operating Lease Rightofuse Asset NoncashIncreaseToOperatingLeaseRightofuseAsset	24000	USD
CY2019	nksh	Noncash Increase To Operating Lease Rightofuse Asset NoncashIncreaseToOperatingLeaseRightofuseAsset	1837000	USD
CY2020	nksh	Noncash Increase To Operating Lease Liability NoncashIncreaseToOperatingLeaseLiability	24000	USD
CY2019	nksh	Noncash Increase To Operating Lease Liability NoncashIncreaseToOperatingLeaseLiability	1837000	USD
CY2018	us-gaap	Debt Securities Held To Maturity Transfer Amount DebtSecuritiesHeldToMaturityTransferAmount	119790000	USD
CY2018	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	1128000	USD
CY2020	nksh	Number Of Days Of Delinquent Loans Nonaccrual Of Interest NumberOfDaysOfDelinquentLoansNonaccrualOfInterest	P90D
CY2020	nksh	Minimum Number Of Days Of Discontinued Loan Payments For Modified Loan To Be Placed On Nonaccrual MinimumNumberOfDaysOfDiscontinuedLoanPaymentsForModifiedLoanToBePlacedOnNonaccrual	P90D
CY2020	nksh	Number Of Days Past Due NumberOfDaysPastDue	P30D
CY2020	nksh	Threshold For Designation To Impaired Status ThresholdForDesignationToImpairedStatus	250000	USD
CY2020	nksh	Minimum Number Of Days Consumer Loans Are Past Due For Losses To Be Charged Off MinimumNumberOfDaysConsumerLoansArePastDueForLossesToBeChargedOff	P120D
CY2020	nksh	Maximum Number Of Days Consumer Loans Are Past Due For Losses To Be Charged Off MaximumNumberOfDaysConsumerLoansArePastDueForLossesToBeChargedOff	P180D
CY2020	nksh	Number Of Days Loans Secured By Residential Or Commercial Real Estate Are Past Due For Losses To Be Carged Off NumberOfDaysLoansSecuredByResidentialOrCommercialRealEstateArePastDueForLossesToBeCargedOff	P180D
CY2020	nksh	Period Of Time Between Issuance Of Loan Commitment And Closing And Sale Of Loans Lower Range PeriodOfTimeBetweenIssuanceOfLoanCommitmentAndClosingAndSaleOfLoansLowerRange	P30D
CY2020	nksh	Period Of Time Between Issuance Of Loan Commitments And Closing And Sale Of Loans Upper Range PeriodOfTimeBetweenIssuanceOfLoanCommitmentsAndClosingAndSaleOfLoansUpperRange	P60D
CY2020Q3	nksh	Market Capitalization MarketCapitalization	164381000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	202194000	USD
CY2020Q4	nksh	Market Capitalization MarketCapitalization	201387000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	200607000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	6483230
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	6580659
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	6957974
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2020	us-gaap	Advertising Expense AdvertisingExpense	99000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	120000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	106000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;"><b>Use of Estimates</b></p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;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, the valuation of OREO, evaluation of impairment of goodwill, and pension obligations.</p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;text-indent:18pt;">Changing economic conditions, adverse economic prospects for borrowers, as well as regulatory agency action as a result of examination, could cause NBB to recognize additions to the allowance for loan losses and <em style="font: inherit;"> may </em>also affect the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans.</p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;"> </p>
CY2020	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;"><b>Reclassifications</b></p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;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 results of operations, financial position, or net cash flow.</p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;"> </p>
CY2020Q4	nksh	Number Of Loan Modifications For Covid19 Related Accommodations NumberOfLoanModificationsForCOVID19RelatedAccommodations	388	pure
CY2020Q4	nksh	Principal Balance Of Loans With Covid19 Related Accommodations PrincipalBalanceOfLoansWithCOVID19RelatedAccommodations	182829000	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
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	435166000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2951000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2854000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	435263000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	4002000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	4048000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	5605000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	5787000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	141804000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	146716000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	378664000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	390191000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	530075000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	546742000	USD
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
CY2020Q4	nksh	Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses ContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	5000	USD
CY2019Q4	nksh	Continuous Unrealized Loss Position Less Than Twelve Months Fair Value ContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	270457000	USD
CY2019Q4	nksh	Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses ContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	2769000	USD
CY2019Q4	nksh	Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value ContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	39553000	USD
CY2019Q4	nksh	Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses ContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	85000	USD
CY2020Q4	nksh	Number Of Temporarily Impaired Securities NumberOfTemporarilyImpairedSecurities	62	pure
CY2020Q4	nksh	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	74662000	USD
CY2020Q4	nksh	Continuous Unrealized Loss Position Aggregate Losses ContinuousUnrealizedLossPositionAggregateLosses	503000	USD
CY2020Q4	nksh	Number Of Temporarily Impaired Securities Greater Than Twelve Months NumberOfTemporarilyImpairedSecuritiesGreaterThanTwelveMonths	2	pure
CY2020Q4	nksh	Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value ContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	4695000	USD
CY2020Q4	nksh	Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses ContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	5000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	251048000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	220999000	USD
CY2020	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	108000	USD
CY2019	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	566000	USD
CY2018	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	17000	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
CY2019	nksh	Proceeds From Calls Of Availableforsale Securities ProceedsFromCallsOfAvailableforsaleSecurities	348032000	USD
CY2019Q4	nksh	Availableforsale Securities Called AvailableforsaleSecuritiesCalled	347466000	USD
CY2019	nksh	Availableforsale Securities Gross Realized Gain Called AvailableforsaleSecuritiesGrossRealizedGainCalled	1157000	USD
CY2019	nksh	Availableforsale Securities Gross Realized Loss Called AvailableforsaleSecuritiesGrossRealizedLossCalled	591000	USD
CY2019	nksh	Availableforsale Securities Gross Realized Gain Loss Called AvailableforsaleSecuritiesGrossRealizedGainLossCalled	566000	USD
CY2018	nksh	Proceeds From Calls Of Availableforsale Securities ProceedsFromCallsOfAvailableforsaleSecurities	17287000	USD
CY2018Q4	nksh	Availableforsale Securities Called AvailableforsaleSecuritiesCalled	17270000	USD
CY2018	nksh	Availableforsale Securities Gross Realized Gain Called AvailableforsaleSecuritiesGrossRealizedGainCalled	17000	USD
CY2018	nksh	Availableforsale Securities Gross Realized Loss Called AvailableforsaleSecuritiesGrossRealizedLossCalled	0	USD
CY2018	nksh	Availableforsale Securities Gross Realized Gain Loss Called AvailableforsaleSecuritiesGrossRealizedGainLossCalled	17000	USD
CY2018	nksh	Proceeds From Calls Of Heldtomaturity Securities ProceedsFromCallsOfHeldtomaturitySecurities	6430000	USD
CY2018Q4	nksh	Heldtomaturity Securities Called HeldtomaturitySecuritiesCalled	6430000	USD
CY2018	nksh	Heldtomaturity Securities Gross Realized Gain Called HeldtomaturitySecuritiesGrossRealizedGainCalled	0	USD
CY2018	nksh	Heldtomaturity Securities Gross Realized Loss Called HeldtomaturitySecuritiesGrossRealizedLossCalled	0	USD
CY2018	nksh	Heldtomaturity Securities Gross Realized Gain Loss Called HeldtomaturitySecuritiesGrossRealizedGainLossCalled	0	USD
CY2018Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	119790000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	118662000	USD
CY2018	us-gaap	Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred To Available For Sale Securities Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	1128000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	15519000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	15118000	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
CY2019	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	6152000	USD
CY2019	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	6372000	USD
CY2020Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	16140000	USD
CY2019Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	7176000	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
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	7390000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	920000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	267000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	126000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	6863000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	7925000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	689000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	235000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-81000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	7390000	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
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	110000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	6753000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	6863000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	5289000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	728738000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	734027000	USD
CY2020	nksh	Ratio Of Allowance For Loan Losses To End Of Period Loans RatioOfAllowanceForLoanLossesToEndOfPeriodLoans	0.0110	pure
CY2019	nksh	Ratio Of Allowance For Loan Losses To End Of Period Loans RatioOfAllowanceForLoanLossesToEndOfPeriodLoans	0.0094	pure
CY2020	nksh	Ratio Of Net Chargeoffs To Average Loans RatioOfNetChargeoffsToAverageLoans	0.0005	pure
CY2019	nksh	Ratio Of Net Chargeoffs To Average Loans RatioOfNetChargeoffsToAverageLoans	0.0009	pure
CY2020	nksh	Ratio Of Allowance For Loan Losses To End Of Period Loans Excluding Ppp Loans RatioOfAllowanceForLoanLossesToEndOfPeriodLoansExcludingPPPLoans	0.0116	pure
CY2020Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	261000	USD
CY2020Q4	nksh	Loan Receivable Nonaccrual LoanReceivableNonaccrual	846000	USD
CY2019Q4	nksh	Loan Receivable Nonaccrual LoanReceivableNonaccrual	164000	USD
CY2020Q4	nksh	Nonaccrual Restructured Loans NonaccrualRestructuredLoans	2839000	USD
CY2019Q4	nksh	Nonaccrual Restructured Loans NonaccrualRestructuredLoans	3211000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	3685000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	3375000	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1553000	USD
CY2019Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1612000	USD
CY2020Q4	nksh	Nonperforming Assets NonperformingAssets	5238000	USD
CY2019Q4	nksh	Nonperforming Assets NonperformingAssets	4987000	USD
CY2020Q4	nksh	Assets Ratio Of Nonperforming Assets To Loans Net Of Unearned Income And Deferred Fees Plus Oreo AssetsRatioOfNonperformingAssetsToLoansNetOfUnearnedIncomeAndDeferredFeesPlusOreo	0.0068	pure
CY2019Q4	nksh	Assets Ratio Of Nonperforming Assets To Loans Net Of Unearned Income And Deferred Fees Plus Oreo AssetsRatioOfNonperformingAssetsToLoansNetOfUnearnedIncomeAndDeferredFeesPlusOreo	0.0068	pure
CY2020Q4	nksh	Ratio Of Allowance For Loan Losses To Nonperforming Loans RatioOfAllowanceForLoanLossesToNonperformingLoans	2.3015	pure
CY2019Q4	nksh	Ratio Of Allowance For Loan Losses To Nonperforming Loans RatioOfAllowanceForLoanLossesToNonperformingLoans	2.0335	pure
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	17000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	231000	USD
CY2020Q4	nksh	Ratio Of Loans Past Due90 Days Or More And Still Accruing To Loans RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans	0.0000	pure
CY2019Q4	nksh	Ratio Of Loans Past Due90 Days Or More And Still Accruing To Loans RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans	0.0003	pure
CY2020Q4	nksh	Accruing Restructured Loans AccruingRestructuredLoans	1410000	USD
CY2019Q4	nksh	Accruing Restructured Loans AccruingRestructuredLoans	1729000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	3858000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	4174000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1045000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1115000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	4903000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	5289000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	75000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	110000	USD
CY2020Q4	nksh	Impaired Loans Net Of Allowance ImpairedLoansNetOfAllowance	4828000	USD
CY2019Q4	nksh	Impaired Loans Net Of Allowance ImpairedLoansNetOfAllowance	5179000	USD
CY2020	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	5093000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	5359000	USD
CY2020	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	54000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	171000	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
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	5757000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	5289000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	4174000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1115000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	110000	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
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	5359000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	171000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	9788000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	250000	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
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	231000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	3375000	USD
CY2020	nksh	Threshold Period For Considering Loans As Special Mention Or Classified ThresholdPeriodForConsideringLoansAsSpecialMentionOrClassified	P75D
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1	pure
CY2019	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	100000	USD
CY2019	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	100000	USD
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1	pure
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	13	pure
CY2018	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	4213000	USD
CY2018	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	4213000	USD
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	13	pure
CY2020Q4	nksh	Number Of Loan Modifications For Covid19 Related Accommodations NumberOfLoanModificationsForCOVID19RelatedAccommodations	388	pure
CY2020Q4	nksh	Principal Balance Of Loans With Covid19 Related Accommodations PrincipalBalanceOfLoansWithCOVID19RelatedAccommodations	182829000	USD
CY2020Q4	nksh	Financing Receivable Number Of Principal And Interest Payment Deferrals FinancingReceivableNumberOfPrincipalAndInterestPaymentDeferrals	75	pure
CY2020Q4	nksh	Financing Receivable Principal And Interest Deferred Payments FinancingReceivablePrincipalAndInterestDeferredPayments	43576000	USD
CY2020Q4	nksh	Financing Receivable Number Deferrals In Modification FinancingReceivableNumberDeferralsInModification	15	pure
CY2020Q4	nksh	Financing Receivable Deferred Payments In Modification FinancingReceivableDeferredPaymentsInModification	38935000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	21429000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	19631000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	11394000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	10712000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10035000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	8919000	USD
CY2020	us-gaap	Depreciation Depreciation	708000	USD
CY2019	us-gaap	Depreciation Depreciation	739000	USD
CY2018	us-gaap	Depreciation Depreciation	766000	USD
CY2020Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	13177000	USD
CY2019Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	22412000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	64320000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	18905000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	2990000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	274000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	3093000	USD
CY2020Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	0	USD
CY2020Q4	us-gaap	Time Deposits TimeDeposits	89582000	USD
CY2020Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	39000	USD
CY2019Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	276000	USD
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	1	pure
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	394000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	379000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	364000	USD
CY2020	nksh	Age Attained To Be Eligible For Esop AgeAttainedToBeEligibleForESOP	P21Y
CY2020	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	300000	USD
CY2020Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	184503
CY2020	nksh	Age Of Employees Required To Diversify Allocated Esop Shares AgeOfEmployeesRequiredToDiversifyAllocatedEsopShares	P55Y
CY2020	nksh	Years Of Plan Participation Required To Diversify Allocated Esop Shares YearsOfPlanParticipationRequiredToDiversifyAllocatedEsopShares	P10Y
CY2020	nksh	Percentage Of Allocated Esop Shares That Can Be Diversified PercentageOfAllocatedEsopSharesThatCanBeDiversified	0.50	pure
CY2020Q4	nksh	Accrued Expenses For Salary Continuation Plan AccruedExpensesForSalaryContinuationPlan	304000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1255000	USD
CY2019Q4	nksh	Accrued Expenses For Salary Continuation Plan AccruedExpensesForSalaryContinuationPlan	270000	USD
CY2018Q4	nksh	Accrued Expenses For Salary Continuation Plan AccruedExpensesForSalaryContinuationPlan	255000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	32415000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	25007000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	5235000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	1436000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	992000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	1823000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	839000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	10725000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2795000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2682000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2942000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	282000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	529000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-382000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3077000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3211000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2560000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4021000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4342000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3929000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	798000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1019000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	62000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	96000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	69000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-208000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-208000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-183000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3077000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3211000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2560000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	1938000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	1597000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	188000	USD
CY2019Q4	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 Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	2697000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	2281000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	866000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	848000	USD
CY2020Q4	nksh	Deferred Tax Assets Leases DeferredTaxAssetsLeases	423000	USD
CY2019Q4	nksh	Deferred Tax Assets Leases DeferredTaxAssetsLeases	480000	USD
CY2020Q4	nksh	Deferred Tax Assets Sba Fees DeferredTaxAssetsSBAFees	191000	USD
CY2019Q4	nksh	Deferred Tax Assets Sba Fees DeferredTaxAssetsSBAFees	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	6303000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	5392000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	424000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	438000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	1228000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	1228000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	2186000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	1308000	USD
CY2020Q4	nksh	Deferred Tax Liabilities Unrealized Gains On Available For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities	3500000	USD
CY2019Q4	nksh	Deferred Tax Liabilities Unrealized Gains On Available For Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities	20000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	419000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	478000	USD
CY2020Q4	nksh	Deferred Tax Liabilities Discount Accretion Of Securities DeferredTaxLiabilitiesDiscountAccretionOfSecurities	15000	USD
CY2019Q4	nksh	Deferred Tax Liabilities Discount Accretion Of Securities DeferredTaxLiabilitiesDiscountAccretionOfSecurities	43000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	7772000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3515000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1469000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1877000	USD
CY2020	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	22000000	USD
CY2019	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	28556000	USD
CY2018	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	9419000	USD
CY2020Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments Without Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval	0	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	189667000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	183056000	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
CY2019	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	21032000	USD
CY2019	us-gaap	Mortgage Loans On Real Estate Cost Of Mortgages Sold MortgageLoansOnRealEstateCostOfMortgagesSold	20496000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	866000	USD
CY2020Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	18000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	546742000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	435263000	USD
CY2020Q4	nksh	Impaired Loans Net Fair Value Disclosure ImpairedLoansNetFairValueDisclosure	970000	USD
CY2019Q4	nksh	Impaired Loans Net Fair Value Disclosure ImpairedLoansNetFairValueDisclosure	1005000	USD
CY2020Q4	nksh	Other Real Estate Fair Value Disclosure OtherRealEstateFairValueDisclosure	1553000	USD
CY2019Q4	nksh	Other Real Estate Fair Value Disclosure OtherRealEstateFairValueDisclosure	1612000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5654000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6154000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6266000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	244000	USD
CY2020	nksh	Revenue From Contract With Customer Including Assessed Tax Outside Of Topic606 RevenueFromContractWithCustomerIncludingAssessedTaxOutsideOfTopic606	2290000	USD
CY2019	nksh	Revenue From Contract With Customer Including Assessed Tax Outside Of Topic606 RevenueFromContractWithCustomerIncludingAssessedTaxOutsideOfTopic606	2636000	USD
CY2018	nksh	Revenue From Contract With Customer Including Assessed Tax Outside Of Topic606 RevenueFromContractWithCustomerIncludingAssessedTaxOutsideOfTopic606	1463000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	7944000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	8790000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	7729000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1998000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	2277000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y9M21D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y10M24D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0304	pure
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0302	pure
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	368000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	310000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	114000	USD
CY2020	us-gaap	Lease Cost LeaseCost	370000	USD
CY2019	us-gaap	Lease Cost LeaseCost	424000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	360000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	414000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	24000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1837000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	363000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	352000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	352000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	334000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	604000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	2249000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	233000	USD

Files In Submission

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$NKSH
NATIONAL BANKSHARES INC Stock $nksh

2021 Q1 Form 10-K Financial Statement

#000143774921006364 Filed on March 18, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NKSH NATIONAL BANKSHARES INC Stock $nksh

2021 Q1 Form 10-K Financial Statement

#000143774921006364 Filed on March 18, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NKSH
NATIONAL BANKSHARES INC Stock $nksh