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Other Real Estate Owned (OREO) (Tables) | 9 Months Ended
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Sep. 30, 2017
Real Estate [Abstract] |
Summary of Changes in the Balance for OREO | Changes in the balance for OREO are as follows (in thousands):
| Nine Months Ended |  | Year Ended
| September 30, 2017 |  | December 31, 2016
Balance at the beginning of year, gross | $ | 250 |  |  | $ | 2,903 |
Transfers in | — |  |  | 287 |
Charge-offs | — |  |  | (251 | )
Sales proceeds | — |  |  | (2,882 | )
Gain on disposition | — |  |  | 193 |
Balance at the end of period, gross | $ | 250 |  |  | $ | 250 |
Less: valuation allowance | — |  |  | — |
Balance at the end of period, net | $ | 250 |  |  | $ | 250 |
Summary of Changes in the Valuation Allowance | Changes in the valuation allowance are as follows (in thousands):
| Nine Months Ended |  | Year Ended
| September 30, 2017 |  | September 30, 2016 |  | December 31, 2016
Balance at beginning of year | $ | — |  |  | $ | 224 |  |  | $ | 224 |
Provision for losses | — |  |  | 27 |  |  | 27 |
Charge-offs, net | — |  |  | (251 | ) |  | (251 | )
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | — |

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- Definition Changes in allowance for OREO losses. + References No definition available. + Details
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Namespace Prefix: | fxnc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of nonconsolidated investments in real estate including interests in corporations, partnerships and joint ventures. Disclosures may include summarized aggregate financial statements for the real estate investments. + References No definition available. + Details
Name: | us-gaap_RealEstateInvestmentFinancialStatementsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration