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Composition of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Securities sold under agreements to repurchase:
Securities sold under agreements to repurchase	$ 116,302us-gaap_SecuritiesSoldUnderAgreementsToRepurchase	$ 121,742us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
FHLB borrowings	90,000us-gaap_FederalHomeLoanBankAdvancesLongTerm	90,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
Subordinated debt	15,464us-gaap_SubordinatedDebt	15,464us-gaap_SubordinatedDebt
Other debt	535fcbc_DebtInstrumentCarryingAmountOfOther	2,535fcbc_DebtInstrumentCarryingAmountOfOther
Total borrowings	222,301us-gaap_InterestBearingDepositLiabilitiesDomestic	229,741us-gaap_InterestBearingDepositLiabilitiesDomestic
Retail
Securities sold under agreements to repurchase:
Securities sold under agreements to repurchase	66,302us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_ExtinguishmentOfDebtAxis = fcbc_RetailMember	71,742us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_ExtinguishmentOfDebtAxis = fcbc_RetailMember
Wholesale
Securities sold under agreements to repurchase:
Securities sold under agreements to repurchase	$ 50,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_ExtinguishmentOfDebtAxis = fcbc_WholesaleMember	$ 50,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_ExtinguishmentOfDebtAxis = fcbc_WholesaleMember

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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