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Benefit Plans (Details Textual) (Pension Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Age
Pension Plans, Defined Benefit [Member]
Benefit Plans (Textual) [Abstract]
Minimum eligibility for full-time employees, age	21
Period of service credit by employee	1 year
Amount contributed to pension plan, Expected in future	$ 500

X

- Details

Name:	fxnc_BenefitPlansTextualAbstract
Namespace Prefix:	fxnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined benefit pension plan minimum eligible age of employee.

+ References

No definition available.

+ Details

Name:	fxnc_DefinedBenefitPensionPlanMinimumEligibleAgeOfEmployee
Namespace Prefix:	fxnc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period of service credit by employee.

+ References

No definition available.

+ Details

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

X

- Definition

The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant