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Note 15 - Commitments and Unfunded Credits (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Amount of Locked Rate Commitments for Mortgage Loans | $ 4,600 |
Access Deposit in Other Commercial Banks | 22 |
Financing Receivable, Held-for-Sale | $ 0 | $ 245

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- Definition The amount of access deposit in other commercial banks. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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

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- Definition Amount, before valuation allowance, of financing receivable classified as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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