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v2.4.1.9

Allowance for Loan Losses - Additional Information (Detail) | Dec. 31, 2014
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Financing Receivable, Allowance for Credit Losses [Line Items] |
Indemnified portion percentage | 80.00%fcbc_IndemnificationPercentage

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- Definition Indemnification Percentage + References No definition available. + Details
Name: | fcbc_IndemnificationPercentage
Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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