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Recorded Investment Unpaid Principal Balance and Related Allowance for Loans losses Excluding Purchased Credit Impaired Loans (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Financing Receivable, Recorded Investment [Line Items] |  |
Loans collectively evaluated for impairment, recorded investment | $ 16,890 | $ 14,220

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- Definition Financing Receivable, Collectively Evaluated for Impairment Recorded Investment + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration