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Other Real Estate Owned (OREO) - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Real Estate [Abstract] |  |  |
Total other real estate owned | $ 1,888 us-gaap_OtherRealEstateAndForeclosedAssets | $ 3,030 us-gaap_OtherRealEstateAndForeclosedAssets |
Net expenses applicable to other real estate owned | $ 81 fxnc_OtherRealEstateOwnedExpenses | $ 150 fxnc_OtherRealEstateOwnedExpenses | $ 443 fxnc_OtherRealEstateOwnedExpenses

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- Definition Other real estate owned expenses. + References No definition available. + Details
Name: | fxnc_OtherRealEstateOwnedExpenses
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherRealEstateAndForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration