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v3.5.0.2

Allowance for Loan Losses - Additional Information (Detail) | Sep. 30, 2016
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Financing Receivable, Allowance for Credit Losses [Line Items] |
Indemnified portion percentage | 80.00%

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