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FDIC Indemnification Asset - Additional Information (Detail) | Sep. 30, 2015
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Waccamaw Bank |
Resale Agreement Counterparty [Line Items] |
Percentage of loan and foreclosed real estate losses covered by FDIC | 80.00%

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- Definition Percentage of loss covered by FDIC. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ResaleAgreementCounterpartyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=fcbc_WaccamawBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |