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Note 15 - Commitments and Unfunded Credits (Details Textual) $ in Millions | Dec. 31, 2023 USD ($)
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Amount of Locked Rate Commitments for Mortgage Loans | $ 1.2
Access Deposit in Other Commercial Banks | $ 1.8

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