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Allowance for Loan Losses - Information Regarding Loans Modified under TDR (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Contract | Dec. 31, 2013 Contract | Dec. 31, 2012 Contracts
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-modification outstanding recorded investment | $ 283 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 |  | $ 2,609 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-modification outstanding recorded investment | 344 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 |  | 2,609 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Real Estate Loans [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts |  |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_ResidentialOneThroughFourFamilyMember
Pre-modification outstanding recorded investment |  |  | 183 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_ResidentialOneThroughFourFamilyMember
Post-modification outstanding recorded investment |  |  | 183 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_ResidentialOneThroughFourFamilyMember
Real Estate Loans [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_OtherRealEstateLoansMember |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_OtherRealEstateLoansMember
Pre-modification outstanding recorded investment | 283 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_OtherRealEstateLoansMember |  | 2,426 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_OtherRealEstateLoansMember
Post-modification outstanding recorded investment | $ 344 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_OtherRealEstateLoansMember |  | $ 2,426 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fxnc_OtherRealEstateLoansMember

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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