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Note 20 - Regulatory Matters (Details Textual)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 01, 2016
Capital Conservation Buffer, Percentage	2.50%	1.875%	0.625%
Capital Conservation Buffer Percentage, Maintained at Bank	6.84%	5.62%

X

- Definition

Represents the required amount of capital conservation buffer as a percentage.

+ References

No definition available.

+ Details

Name:	fxnc_CapitalConservationBufferPercentage
Namespace Prefix:	fxnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amount of capital conservation buffer, as a percentage, maintained at a bank.

+ References

No definition available.

+ Details

Name:	fxnc_CapitalConservationBufferPercentageMaintainedAtBank
Namespace Prefix:	fxnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration