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Note 18 - Dividend Reinvestment Plan (Details Textual) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Quoted Prices Preceding Dividend Payment Date Period (Day)	10 days
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares)	9,449	5,671

X

- Definition

Number of consecutive trading days for purchase of common share.

+ References

No definition available.

+ Details

Name:	fxnc_QuotedPricesPrecedingDividendPaymentDatePeriod
Namespace Prefix:	fxnc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration