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Deposits - Additional Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Deposit Liabilities [Line Items] |  |
Time deposit of $250 thousand or more | $ 41,549 | $ 41,350

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- Definition Deposit Liabilities [Line Items] + References No definition available. + Details
Name: | fcbc_DepositLiabilitiesLineItems
Namespace Prefix: | fcbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Time Deposits, $250,000 or More + References No definition available. + Details
Name: | fcbc_TimeDeposits250000OrMore
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant