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Litigation, Commitments and Contingencies - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Line Items]
Commitments to extend credit	$ 236,471,000us-gaap_LettersOfCreditOutstandingAmount	$ 216,179,000us-gaap_LettersOfCreditOutstandingAmount
Trust preferred securities	15,460,000fcbc_TrustPreferredSecurities
FHLB Borrowings
Commitments and Contingencies Disclosure [Line Items]
Commitments to extend credit	$ 6,180,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember

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- Definition

Trust preferred securities.

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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.

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