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Allowance for Loan Losses - Additional Information (Detail)	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Indemnified portion percentage	80.00%fcbc_IndemnificationPercentage

X

- Definition

Indemnification Percentage

+ References

No definition available.

+ Details

Name:	fcbc_IndemnificationPercentage
Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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