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FDIC Indemnification Asset - Additional Information (Detail) (Waccamaw Bank)	Mar. 31, 2015
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

X

- 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

X

- Details

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