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Note 16 - Commitments and Unfunded Credits (Details Textual) $ in Millions	Dec. 31, 2024 USD ($)
Amount of Locked Rate Commitments for Mortgage Loans	$ 2.3
Access Deposit in Other Commercial Banks	$ 3.9

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