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Loans - Summary of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Real estate loans:
Commercial and industrial loans	$ 21,420us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial	$ 21,166us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
Consumer and other loans	11,983us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer	12,240us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
Total loans	398,517us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	378,410us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	359,533us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Allowance for loan losses	(6,771)us-gaap_LoansAndLeasesReceivableAllowance	(6,718)us-gaap_LoansAndLeasesReceivableAllowance	(10,283)us-gaap_LoansAndLeasesReceivableAllowance	(10,644)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net	391,746us-gaap_LoansAndLeasesReceivableNetReportedAmount	371,692us-gaap_LoansAndLeasesReceivableNetReportedAmount
Construction and Land Development [Member]
Real estate loans:
Real estate loans	33,344us-gaap_LoansAndLeasesReceivableGrossCarryingAmountOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember	29,475us-gaap_LoansAndLeasesReceivableGrossCarryingAmountOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember
Total loans	33,344us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember	29,475us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember	33,876us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember
Allowance for loan losses	(1,601)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember	(1,403)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember	(2,252)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember	(2,710)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember
Secured by 1-4 Family Residential [Member]
Real estate loans:
Real estate loans	172,874us-gaap_LoansAndLeasesReceivableGrossCarryingAmountOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember	163,727us-gaap_LoansAndLeasesReceivableGrossCarryingAmountOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember
Total loans	172,874us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember	163,727us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember	147,541us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember
Allowance for loan losses	(952)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember	(1,204)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember	(2,950)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember	(2,975)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember
Other Real Estate Loans [Member]
Real estate loans:
Real estate loans	158,896us-gaap_LoansAndLeasesReceivableGrossCarryingAmountOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember	151,802us-gaap_LoansAndLeasesReceivableGrossCarryingAmountOther / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember
Total loans	$ 158,896us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember	$ 151,802us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Reflects the aggregate gross carrying amount of all commercial loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on commercial loans and leases.

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Reflects the aggregate gross carrying amount of all consumer loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on consumer loans and leases.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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