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Commitments and Unfunded Credits - Financial Instruments Representing Credit Risk (Detail) (First Bank [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Contract amounts represent credit risk	$ 60,019us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / dei_LegalEntityAxis = fxnc_FirstBankMember	$ 59,115us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember / dei_LegalEntityAxis = fxnc_FirstBankMember
Stand-By Letters of Credit [Member]
Other Commitments [Line Items]
Contract amounts represent credit risk	$ 9,763us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / dei_LegalEntityAxis = fxnc_FirstBankMember	$ 7,610us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember / dei_LegalEntityAxis = fxnc_FirstBankMember

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- Definition

The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration