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Litigation, Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]
Commitments to extend credit	$ 235,302	$ 236,471
Trust preferred securities	15,460
FHLB Borrowings
Commitments and Contingencies Disclosure [Line Items]
Commitments to extend credit	$ 22,690	$ 6,180

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- Definition

Commitments and Contingencies Disclosure [Line Items]

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No definition available.

+ Details

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Namespace Prefix:	fcbc_
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Balance Type:	na
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- Definition

Trust preferred securities.

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No definition available.

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: