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Note 8 - Deposits (Details Textual) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Time Deposits, at or Above FDIC Insurance Limit | $ 57.5 | $ 28.8
Brokered Deposits | $ 7.4 | $ 3.9

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- Definition The carrying values of brokered deposits. + References No definition available. + Details
Name: | fxnc_BrokeredDeposits
Namespace Prefix: | fxnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478353/942-405-50-1 + Details
Name: | us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant