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Note 4 - Credit Quality - Collateral Dependent Loans (Details) $ in Thousands | Jun. 30, 2021 USD ($)
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Collateral dependent loans | $ 3,017
Collateral coverage | $ 3,084
Collateral coverage percentage | 102.22%
Commercial Real Estate, Hotel 1 [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Commercial Real Estate, Office [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Commercial Real Estate, Other [Member] |
Collateral dependent loans | $ 2,791
Collateral coverage | $ 2,858
Collateral coverage percentage | 102.40%
Commercial Real Estate, Retail [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Multi-family, Industrial [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Multi-family, Office [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Multi-family, Other [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Commercial and Industrial, Industrial [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Commercial and Industrial, Other [Member] |
Collateral dependent loans | $ 0
Collateral coverage | $ 0
Collateral coverage percentage | 0.00%
Consumer Owner Occupied, Other [Member] |
Collateral dependent loans | $ 41
Collateral coverage | $ 41
Collateral coverage percentage | 100.00%
Consumer, Other [Member] |
Collateral dependent loans | $ 185
Collateral coverage | $ 185
Collateral coverage percentage | 100.00%

X
- Definition Represents the amount of collateral dependent loans as of the specified date. + References No definition available. + Details
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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

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

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

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

X
- 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
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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: |

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