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Note 4 - Allowance for Loan Losses (Details Textual) xbrli-pure in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring | $ 6,000 | $ 6,000 |
Financing Receivable, Modifications, Number of Contracts | 0 |  | 0
Financing Receivable, Deferred Payments | $ 0 |  |
Financing Receivable, Modifications, Interest Only Payments | 14,300 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 0 |  | $ 0
Minimum [Member] |  |  |
Financing Receivable, Modifications, Interest Only Payments, Period (Month) |  | 180 days |
Maximum [Member] |  |  |
Financing Receivable, Modifications, Interest Only Payments, Period (Month) |  | 2 years |
Performing Financial Instruments [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring | $ 0 | $ 0 |

X
- Definition Deferred amounts on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amounts of loans modified allowing interest only payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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Namespace Prefix: | fxnc_
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Period Type: | instant

X
- Definition Period of interest only payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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X
- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details
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- Details
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- Details
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