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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | $ 398,517 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 378,410 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 359,533 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 33,344 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember | 29,475 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember | 33,876 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 172,874 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember | 163,727 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember | 147,541 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 158,896 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember | 151,802 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 21,420 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember | 21,166 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember | 23,381 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember
Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 11,983 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConsumerAndOtherLoansMember | 12,240 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConsumerAndOtherLoansMember | 12,016 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConsumerAndOtherLoansMember
Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 353,057 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 331,359 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember |
Pass [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 24,129 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 20,476 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember |
Pass [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 162,248 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 152,004 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember |
Pass [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 134,037 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 126,211 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember |
Pass [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 20,660 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 20,428 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember |
Pass [Member] | Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 11,983 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConsumerAndOtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 12,240 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConsumerAndOtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember |
Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 22,550 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 23,259 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Special Mention [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 3,250 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 2,962 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Special Mention [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 4,652 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 5,058 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Special Mention [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 14,196 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 14,776 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Special Mention [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 452 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 463 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 22,910 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 23,792 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |
Substandard [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 5,965 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 6,037 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ConstructionAndLandPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |
Substandard [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 5,974 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 6,665 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_ResidentialOneThroughFourFamilyMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |
Substandard [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | 10,663 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 10,815 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_OtherRealEstateLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |
Substandard [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total | $ 308 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | $ 275 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fxnc_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |

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