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Note 12 - Funds Restrictions and Reserve Balance (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Aggregate Amount of Unrestricted Funds Transferred from Bank | $ 20,800 |
Aggregate Amount of Daily Average Deposit |  | $ 0

X
- Definition The aggregate amounts of daily average required balances. + References No definition available. + Details
Name: | fxnc_AggregateAmountOfDailyAverageDeposit
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate amount of unrestricted funds that transferred from bank. + References No definition available. + Details
Name: | fxnc_AggregateAmountOfUnrestrictedFundsTransferredFromBank
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant