XML 66 R55.htm IDEA: XBRL DOCUMENT
v3.23.1

Note 6 - Fair Value Measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Nonrecurring [Member] $ in Thousands | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Other Real Estate Owned [Member] |  |  |
Assets, Fair Value |  | $ 184 | $ 1,848
Collateral Dependent Loans [Member] |  |  |
Assets, Fair Value |  | $ 1,591 |
Impaired Loans [Member] |  |  |
Assets, Fair Value |  |  | $ 197
Fair Value, Inputs, Level 3 [Member] |  |  |
Impaired loans, net |  |  | 197
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Cost to Sell [Member] |  |  |
Other real estate owned | [1] | 0.1000 | 0.1000
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |  |
Assets, Fair Value |  | $ 184 | $ 184
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Valuation Technique, Property Appraisals [Member] |  |  |
Assets, Fair Value |  | 184 | 184
Fair Value, Inputs, Level 3 [Member] | Collateral Dependent Loans [Member] |  |  |
Assets, Fair Value |  | $ 1,591 |
Fair Value, Inputs, Level 3 [Member] | Collateral Dependent Loans [Member] | Measurement Input, Discount Rate [Member] |  |  |
Collateral dependent loans |  | 0.0650 |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |  |
Assets, Fair Value |  |  | $ 197
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Measurement Input, Cost to Sell [Member] |  |  |
Impaired loans, net |  |  | 6.50
[1] | Unobservable inputs were weighted by the relative fair value of the instruments.

X
- Definition Value of input used to measure collateral dependent loans. + References No definition available. + Details
Name: | fxnc_CollateralDependentLoansMeasurementInput
Namespace Prefix: | fxnc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of input used to measure impaired loans. + References No definition available. + Details
Name: | fxnc_ImpairedLoansMeasurementInput
Namespace Prefix: | fxnc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=fxnc_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=fxnc_CollateralDependentLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=fxnc_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputCostToSellMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=fxnc_ValuationTechniquePropertyAppraisalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |