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

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