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Income Taxes - Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets
Allowance for loan losses	$ 2,284us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	$ 3,619us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Allowance for other real estate owned	127fxnc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForOtherRealEstateOwned	566fxnc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForOtherRealEstateOwned
Unfunded pension liability	732us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	90us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Split dollar liability		207fxnc_DeferredTaxAssetsSplitDollarLiability
Gain on other real estate owned	639fxnc_DeferredTaxAssetsGainOnOtherRealEstateOwned	769fxnc_DeferredTaxAssetsGainOnOtherRealEstateOwned
Securities available for sale	71us-gaap_DeferredTaxAssetsInvestments	584us-gaap_DeferredTaxAssetsInvestments
Accrued pension	392fxnc_DeferredTaxAssetsAccruedPensionLiability	289fxnc_DeferredTaxAssetsAccruedPensionLiability
Loan origination costs, net		6fxnc_DeferredTaxAssetsLoanOriginationCostNet
Other	13us-gaap_DeferredTaxAssetsOther	10us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross, Total	4,258us-gaap_DeferredTaxAssetsGross	6,140us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities
Depreciation	604us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	685us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Discount accretion	2fxnc_DeferredTaxLiabilitiesDiscountAccretion	5fxnc_DeferredTaxLiabilitiesDiscountAccretion
Loan origination fees, net	44fxnc_DeferredTaxLiabilitiesLoanOriginationCostsNet
Deferred Tax Liabilities, Total	650fxnc_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance	690fxnc_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance
Net deferred tax assets	$ 3,608us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 5,450us-gaap_DeferredTaxAssetsLiabilitiesNet

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