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Note 5 - Allowance for Loan Losses on Loans and Nonperforming Assets - Ratios of Allowance for Loan Losses (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Ratio of ACLL to the end of period loans, net of unearned income and deferred fees and costs	1.06%	0.96%
Ratio of net charge-offs to average loans, net of unearned income and deferred fees and costs	0.02%	0.02%

X

- Definition

Represents ratio of net charge-offs to average loans, net of unearned income and deferred fees.

+ References

No definition available.

+ Details

Name:	nksh_RatioOfNetChargeoffsToAverageLoans
Namespace Prefix:	nksh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of allowance for credit loss to total financing receivable outstanding.

+ References

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

+ Details

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