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Note 5 - Credit Quality - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Collateral dependent loans | $ 1,173 | $ 589
Collateral coverage | $ 825 | $ 574
Collateral coverage percentage | 70.33% | 97.45%
Commercial Real Estate, Other [Member] |  |
Collateral dependent loans | $ 1,173 | $ 0
Collateral coverage | $ 825 | $ 0
Collateral coverage percentage | 70.33% | 0.00%
Consumer, Other [Member] |  |
Collateral dependent loans | $ 0 | $ 589
Collateral coverage | $ 0 | $ 574
Collateral coverage percentage |  | 97.45%

X
- Definition Represents the amount of collateral dependent loans as of the specified date. + References No definition available. + Details
Name: | fcbc_CollateralDependentLoans
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of collateral coverage associated with collateral dependent loans as of the specified date. + References No definition available. + Details
Name: | fcbc_CollateralDependentLoansCollateralCoverage
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage that expresses the extent to which collateral dependent loans are collateralized. + References No definition available. + Details
Name: | fcbc_CollateralDependentLoansCollateralCoveragePercentage
Namespace Prefix: | fcbc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_CollateralAxis=fcbc_CommercialRealEstateOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=fcbc_ConsumerOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |