XML 111 R97.htm IDEA: XBRL DOCUMENT
v3.23.1

Note 20 - Regulatory Matters (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum | 0.0250 | 0.0250
Capital Conservation Buffer Percentage, Maintained at Bank | 6.60% | 6.76%

X
- Definition Represents the amount of capital conservation buffer, as a percentage, maintained at a bank. + References No definition available. + Details
Name: | fxnc_CapitalConservationBufferPercentageMaintainedAtBank
Namespace Prefix: | fxnc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_BankingRegulationCapitalConservationBufferCapitalConservedMinimum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant