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Note 5 - Credit Quality - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Collateral dependent loans | $ 589 | $ 2,216
Collateral coverage | $ 574 | $ 2,312
Collateral coverage percentage | 97.45% | 104.33%
Commercial Real Estate, Hotel 1 [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Commercial Real Estate, Office [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Commercial Real Estate, Other [Member] |  |
Collateral dependent loans | $ 0 | $ 2,216
Collateral coverage | $ 0 | $ 2,312
Collateral coverage percentage | 0.00% | 104.33%
Commercial Real Estate, Retail [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Multi-family, Industrial [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Multi-family, Office [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Multi-family, Other [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Commercial and Industrial, Industrial [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Commercial and Industrial, Other [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Consumer Owner Occupied, Other [Member] |  |
Collateral dependent loans | $ 0 | $ 0
Collateral coverage | $ 0 | $ 0
Collateral coverage percentage | 0.00% | 0.00%
Consumer, Other [Member] |  |
Collateral dependent loans | $ 589 | $ 0
Collateral coverage | $ 574 | $ 0
Collateral coverage percentage | 97.45% | 0.00%

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

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- 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

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- Details
Name: | us-gaap_CollateralAxis=fcbc_CommercialRealEstateHotel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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

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