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Note 7 - Capital Requirements (Details Textual)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Capital Conservation Buffer Phase, Period	4 years
Capital Conservation Buffer Percentage, Annual Installment	0.625%
Capital Conservation Buffer, Percentage	2.50%	1.875%
Capital Conservation Buffer Percentage, Maintained at Bank	6.57%	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, required to be contributed per year over the capital conservation phase-in period.

+ References

No definition available.

+ Details

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

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

X

- Definition

The length of time in which the capital conservation buffer will be phased in time.

+ References

No definition available.

+ Details

Name:	fxnc_CapitalConservationBufferPhasePeriod
Namespace Prefix:	fxnc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration