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Deposits - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deposit Liabilities [Line Items]
Time deposit of $250 thousand or more	$ 60,268fcbc_TimeDeposits250000OrMore	$ 40,820fcbc_TimeDeposits250000OrMore

X

- 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