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Note 12 - Funds Restrictions and Reserve Balance (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Aggregate Amount of Unrestricted Funds Transferred from Bank	$ 14,100
Aggregate Amount of Daily Average Deposit	$ 0	$ 8,300

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