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Loans - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2014 Segment
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of loan portfolio segments | 3

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- Definition Number Of Loan Portfolio Segments + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration