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Note 3 - Loan Portfolio (Details) - Loan Portfolio, Excluding Loans Held for Sale (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 623,012us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 606,319us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Less unearned income and deferred fees (841)us-gaap_LoansAndLeasesReceivableDeferredIncome (853)us-gaap_LoansAndLeasesReceivableDeferredIncome
Loans, net of unearned income and deferred fees 622,171us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 605,466us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Real Estate Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 41,647us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_RealEstateConstructionMember
45,562us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_RealEstateConstructionMember
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 145,700us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_ConsumerRealEstateMember
147,040us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_ConsumerRealEstateMember
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 321,838us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_CommercialRealEstateLoansMember
310,762us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_CommercialRealEstateLoansMember
Commercial Non Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 32,182us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_CommercialNonRealEstateMember
33,412us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_CommercialNonRealEstateMember
Public Sector and IDA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 53,441us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_PublicSectorAndIdaMember
41,361us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_PublicSectorAndIdaMember
Consumer Non Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 28,204us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_ConsumerNonRealEstateMember
$ 28,182us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nksh_ConsumerNonRealEstateMember