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Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate [Abstract]      
Balance at the beginning of year, gross $ 4,695us-gaap_OtherRealEstate $ 7,764us-gaap_OtherRealEstate  
Transfers in 139us-gaap_OtherRealEstateAdditions 2,036us-gaap_OtherRealEstateAdditions  
Charge-offs (1,302)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied (1,564)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied (1,808)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied
Sales proceeds (1,502)us-gaap_OtherRealEstateDisposals (3,618)us-gaap_OtherRealEstateDisposals  
Gain on disposition 307fxnc_OtherRealEstateGrossGains 80fxnc_OtherRealEstateGrossGains  
Deferred gain recognized (73)fxnc_DeferredGainsRecognizedOnOtherRealEstate    
Depreciation (1)fxnc_DepreciationOnOtherRealEstate (3)fxnc_DepreciationOnOtherRealEstate  
Balance at the end of year, gross 2,263us-gaap_OtherRealEstate 4,695us-gaap_OtherRealEstate 7,764us-gaap_OtherRealEstate
Less: valuation allowance (375)us-gaap_OtherRealEstateValuationAdjustments (1,665)us-gaap_OtherRealEstateValuationAdjustments  
Balance at the end of year, net $ 1,888us-gaap_OtherRealEstateAndForeclosedAssets $ 3,030us-gaap_OtherRealEstateAndForeclosedAssets