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Note 6 - Allowance for Credit Losses - Allowance for Loan Losses on PCI Loans and Recorded Investment (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Acquired impaired loans evaluated for impairment | $ 39,662
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] |
Acquired impaired loans evaluated for impairment | 25,804
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] | Construction and Land Development [Member] |
Acquired impaired loans evaluated for impairment | 958
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] | Farmland and Other Agricultural [Member] |
Acquired impaired loans evaluated for impairment | 2,242
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] | Multifamily [Member] |
Acquired impaired loans evaluated for impairment | 1,614
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] | Commercial Real Estate-owner Occupied [Member] |
Acquired impaired loans evaluated for impairment | 16,717
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] | Commercial Real Estate Non-owner Occupied [Member] |
Acquired impaired loans evaluated for impairment | 3,459
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |
Acquired impaired loans evaluated for impairment | 814
Allowance for acquired impaired loans | 0
Commercial Portfolio Segment [Member] | Other Commercial Loan [Member] |
Acquired impaired loans evaluated for impairment | 0
Allowance for acquired impaired loans | 0
Consumer Real Estate Portfolio Segment [Member] |
Acquired impaired loans evaluated for impairment | 13,858
Allowance for acquired impaired loans | 0
Consumer Real Estate Portfolio Segment [Member] | 1-4 Family, Junior and HELOCS [Member] |
Acquired impaired loans evaluated for impairment | 761
Allowance for acquired impaired loans | 0
Consumer Real Estate Portfolio Segment [Member] | 1-4 Family, Senior-consumer [Member] |
Acquired impaired loans evaluated for impairment | 12,494
Allowance for acquired impaired loans | 0
Consumer Real Estate Portfolio Segment [Member] | Consumer Loan [Member] |
Acquired impaired loans evaluated for impairment | 603
Allowance for acquired impaired loans | $ 0

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- Definition Represents the amount of acquired impaired loans evaluated for impairment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount of allowance for acquired impaired loans. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_FinancialInstrumentAxis=fcbc_ConstructionAndLandDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=fcbc_FarmlandAndOtherAgriculturalMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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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
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- Details
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- Details
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- Details
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- Details
Name: | us-gaap_FinancialInstrumentAxis=fcbc_OneFourFamilyJuniorAndHelocsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_FinancialInstrumentAxis=fcbc_OneFourFamilySeniorConsumerMember
Namespace Prefix: |
Data Type: | na
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- Details
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