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Litigation, Commitments and Contingencies - Additional Information (Detail) $ in Thousands | Sep. 30, 2016 USD ($)
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Commitments and Contingencies Disclosure [Line Items] |
Trust preferred securities | $ 15,460

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- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
Name: | fcbc_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | fcbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Trust preferred securities. + References No definition available. + Details
Name: | fcbc_TrustPreferredSecurities
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant