XML 51 R61.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Allowance for Loan Losses (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Information regarding loans modified under TDR |  |
Number of Contracts | $ 2 | $ 19
Pre-modification outstanding recorded investment | 2,609,000 | 16,197,000
Post-modification outstanding recorded investment | 2,609,000 | 15,879,000
Commercial and industrial [Member] |  |
Information regarding loans modified under TDR |  |
Number of Contracts |  |
Pre-modification outstanding recorded investment |  |
Post-modification outstanding recorded investment |  |
Consumer and other loans [Member] |  |
Information regarding loans modified under TDR |  |
Number of Contracts |  |
Pre-modification outstanding recorded investment |  |
Post-modification outstanding recorded investment |  |
Construction [Member] | Real estate loans [Member] |  |
Information regarding loans modified under TDR |  |
Number of Contracts |  | 1
Pre-modification outstanding recorded investment |  | 701,000
Post-modification outstanding recorded investment |  | 357,000
Other real estate loans [Member] | Real estate loans [Member] |  |
Information regarding loans modified under TDR |  |
Number of Contracts | 1 | 14
Pre-modification outstanding recorded investment | 2,426,000 | 12,829,000
Post-modification outstanding recorded investment | 2,426,000 | 12,855,000
Secured by 1-4 family residential [Member] | Real estate loans [Member] |  |
Information regarding loans modified under TDR |  |
Number of Contracts | 1 | 4
Pre-modification outstanding recorded investment | 183,000 | 2,667,000
Post-modification outstanding recorded investment | $ 183,000 | $ 2,667,000

X
- Definition Financing receivables modifications number of contracts one. + References No definition available. + Details
Name: | fxnc_FinancingReceivablesModificationsNumberOfContractsOne
Namespace Prefix: | fxnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing receivables modifications post modification recorded investment 1. + References No definition available. + Details
Name: | fxnc_FinancingReceivablesModificationsPostModificationRecordedInvestmentOne
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing receivables modifications pre modification recorded investment 1. + References No definition available. + Details
Name: | fxnc_FinancingReceivablesModificationsPreModificationRecordedInvestmentOne
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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