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Note 2 - Loans and Allowance for Credit Losses - Loans Past Due 90 Days or More and Impaired Loans (Details)	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Ratio of ACLL to nonaccrual loans	341.53%	288.90%	284.18%
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%	0.01%

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

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Namespace Prefix:	nksh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of allowance for credit loss to nonaccrual financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)
-Publisher SEC

+ Details

Name:	srt_FinancingReceivableAllowanceForCreditLossToNonaccrualPercent
Namespace Prefix:	srt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant