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Loans - Additional Information (Detail) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) Segment | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loan portfolio segments | Segment | 3 |
Deferred loan fees | $ 3,740 | $ 3,390

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- Definition Deferred Loan Fees + References No definition available. + Details
Name: | fcbc_DeferredLoanFees
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration