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FDIC Indemnification Asset - Additional Information (Detail) (Waccamaw Bank) | Dec. 31, 2014 | Jun. 08, 2012
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Waccamaw Bank |  |
Resale Agreement Counterparty [Line Items] |  |
Percentage of loan and foreclosed real estate losses covered by FDIC | 80.00%fcbc_PercentageOfLossCoveredByFdic / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember | 80.00%fcbc_PercentageOfLossCoveredByFdic / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember

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- Definition Percentage of loss covered by FDIC. + References No definition available. + Details
Name: | fcbc_PercentageOfLossCoveredByFdic
Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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