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v2.4.1.9

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

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