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Interest Income Related to Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Interest income recognized | $ 148 | $ 188 | $ 456 | $ 466

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- Definition Interest income recognized on loan restructurings. + References No definition available. + Details
Name: | fcbc_InterestIncomeRecognizedOnLoanRestructurings
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration