XML 94 R90.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Commitments and Unfunded Credits (Details Textual) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
--- | ---
Commitments and Unfunded Credits (Textual) [Abstract] |
Locked-rate commitments to originate mortgage loans | $ 806
Loans held for sale | 503
Amount on deposit in banks exceeded the insurance limits of the Federal Deposit Insurance Corporation | $ 7

X
- Definition Access deposit in other commercial banks. + References No definition available. + Details
Name: | fxnc_AccessDepositInOtherCommercialBanks
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of locked rate commitments for loans held for sale. + References No definition available. + Details
Name: | fxnc_AmountOfLockedRateCommitmentsForLoansHeldForSale
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of locked rate commitments for mortgage loans. + References No definition available. + Details
Name: | fxnc_AmountOfLockedRateCommitmentsForMortgageLoans
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | fxnc_CommitmentsAndUnfundedCreditsTextualAbstract
Namespace Prefix: | fxnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration