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Loans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Segment	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan portfolio segments	3fcbc_NumberOfLoanPortfolioSegments
Deferred loan fees	$ 3.50fcbc_DeferredLoanFees	$ 3.39fcbc_DeferredLoanFees

X

- Definition

Deferred Loan Fees

+ References

No definition available.

+ Details

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

X

- Definition

Number Of Loan Portfolio Segments

+ References

No definition available.

+ Details

Name:	fcbc_NumberOfLoanPortfolioSegments
Namespace Prefix:	fcbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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