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Note 15 - Commitments and Unfunded Credits (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amount of Locked Rate Commitments for Mortgage Loans	$ 4,600
Access Deposit in Other Commercial Banks	22
Financing Receivable, Held-for-Sale	$ 0	$ 245

X

- Definition

The amount of access deposit in other commercial banks.

+ References

No definition available.

+ Details

Name:	fxnc_AccessDepositInOtherCommercialBanks
Namespace Prefix:	fxnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of locked rate commitments for mortgage loans.

+ References

No definition available.

+ Details

Name:	fxnc_AmountOfLockedRateCommitmentsForMortgageLoans
Namespace Prefix:	fxnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004

+ Details

Name:	us-gaap_LoansReceivableHeldForSaleAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant