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Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Loans Past Due 90 Days or More and Impaired Loans (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Loans Past Due 90 Days or More and Impaired Loans [Abstract]      
Loans past due 90 days or more and still accruing $ 272us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing [1] $ 163us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing $ 207us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing [1]
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees 0.04%nksh_RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans 0.03%nksh_RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans 0.03%nksh_RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans
Accruing restructured loans 5,992nksh_AccruingRestructuredLoans 6,145nksh_AccruingRestructuredLoans 6,040nksh_AccruingRestructuredLoans
Impaired loans with no valuation allowance 11,265us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment [2],[3] 10,139us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment 7,615us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment [2],[3]
Impaired loans with a valuation allowance 3,729us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment [2],[3] 2,463us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment 7,506us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment [2],[3]
Total impaired loans 14,994us-gaap_ImpairedFinancingReceivableRecordedInvestment [2],[3] 12,602us-gaap_ImpairedFinancingReceivableRecordedInvestment 15,121us-gaap_ImpairedFinancingReceivableRecordedInvestment [2],[3]
Valuation allowance (236)us-gaap_ImpairedFinancingReceivableRelatedAllowance [3] (280)us-gaap_ImpairedFinancingReceivableRelatedAllowance (282)us-gaap_ImpairedFinancingReceivableRelatedAllowance [3]
Impaired loans, net of allowance 14,758nksh_ImpairedLoansNetOfAllowance 12,322nksh_ImpairedLoansNetOfAllowance 14,839nksh_ImpairedLoansNetOfAllowance
Average recorded investment in impaired loans(1) 15,192us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment [2],[4] 13,075us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment [2],[4] 16,311us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment [2]
Interest income recognized on impaired loans, after designation as impaired 174us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod [4] 99us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod [4] 473us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Amount of income recognized on a cash basis $ 0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod $ 0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod $ 0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
[1] Only classes with past-due or nonaccrual loans are shown.
[2] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[3] Only classes with impaired loans are shown
[4] Only classes with impaired loans are shown.