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v2.4.1.9

Parent Company Only Financial Statements - Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income |  |  |
Gain on sale of securities available for sale | $ 787 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 1,300 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Other income | 58 us-gaap_NoninterestIncomeOtherOperatingIncome | 121 us-gaap_NoninterestIncomeOtherOperatingIncome | 211 us-gaap_NoninterestIncomeOtherOperatingIncome
Expense |  |  |
Interest expense | 1,778 us-gaap_InterestExpense | 2,709 us-gaap_InterestExpense | 4,167 us-gaap_InterestExpense
Stationery and supplies | 333 us-gaap_SuppliesExpense | 288 us-gaap_SuppliesExpense | 308 us-gaap_SuppliesExpense
Legal and professional fees | 1,019 us-gaap_ProfessionalFees | 975 us-gaap_ProfessionalFees | 975 us-gaap_ProfessionalFees
Allocated income tax benefit | (3,499)us-gaap_IncomeTaxExpenseBenefit | 4,820 us-gaap_IncomeTaxExpenseBenefit | (965)us-gaap_IncomeTaxExpenseBenefit
Net income | 7,631 us-gaap_NetIncomeLoss | 9,874 us-gaap_NetIncomeLoss | 2,800 us-gaap_NetIncomeLoss
Effective dividend and accretion on preferred stock | 1,138 us-gaap_PreferredStockDividendsIncomeStatementImpact | 913 us-gaap_PreferredStockDividendsIncomeStatementImpact | 904 us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common shareholders | 6,493 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 8,961 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,896 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Parent Company [Member] |  |  |
Income |  |  |
Dividends from subsidiary |  |  | 500 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gain on sale of securities available for sale |  |  | 139 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income | 26 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 51 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Income | 26 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 51 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 680 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expense |  |  |
Interest expense | 218 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 222 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 237 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stationery and supplies | 18 us-gaap_SuppliesExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17 us-gaap_SuppliesExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_SuppliesExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Legal and professional fees | 37 us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 40 us-gaap_ProfessionalFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Data processing | 67 fxnc_DataProcessingFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 53 fxnc_DataProcessingFees / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Management fee-subsidiary | 251 fxnc_ManagementFeePaidToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 95 fxnc_ManagementFeePaidToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other expense | 13 us-gaap_OtherGeneralExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 51 us-gaap_OtherGeneralExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6 us-gaap_OtherGeneralExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expense | 604 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 478 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 244 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) before allocated tax benefits and undistributed income of subsidiary | (578)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (427)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 436 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Allocated income tax benefit | 197 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 145 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) before equity in undistributed income of subsidiary | (381)fxnc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterestAfterTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (282)fxnc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterestAfterTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 458 fxnc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterestAfterTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed income of subsidiary | 8,012 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,156 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,342 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | 7,631 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,874 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,800 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Effective dividend and accretion on preferred stock | 1,138 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 913 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 904 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income available to common shareholders | $ 6,493 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 8,961 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1,896 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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