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FDIC Indemnification Asset - Additional Information (Detail) - Waccamaw Bank - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Resale Agreement Counterparty [Line Items]
Percentage of loan and foreclosed real estate losses covered by FDIC	80.00%
Loss Share Agreements Entered	$ 76,540	$ 83,040
Loss Share Agreements Entered	$ 2,280	$ 4,030

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- Definition

Loans Receivable Covered By Loss Share Agreements

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No definition available.

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Balance Type:	debit
Period Type:	instant

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- Definition

Other Real Estate Owned Covered By Loss Share Agreements

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No definition available.

+ Details

Name:	fcbc_OtherRealEstateOwnedCoveredByLossShareAgreements
Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Percentage of loss covered by FDIC.

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No definition available.

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Namespace Prefix:	fcbc_
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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.

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No definition available.

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

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- Details

Name:	us-gaap_BusinessAcquisitionAxis=fcbc_WaccamawBankMember
Namespace Prefix:
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Balance Type:
Period Type: