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v3.23.1

Note 2 - Loans and Allowance for Credit Losses - Loans Past Due 90 Days or More and Impaired Loans (Details) | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Ratio of ACLL to nonaccrual loans | 378.46% | 288.90% | 272.12%
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees and costs | 0.00% | 0.00% | 0.05%

X
- Definition Refers to ratio of allowance for loan losses to nonperforming loans. + References No definition available. + Details
Name: | nksh_RatioOfAllowanceForLoanLossesToNonperformingLoans
Namespace Prefix: | nksh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees. + References No definition available. + Details
Name: | nksh_RatioOfLoansPastDue90DaysOrMoreAndStillAccruingToLoans
Namespace Prefix: | nksh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant