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Aggregate Activity in Allowance For Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 20,227us-gaap_LoansAndLeasesReceivableAllowance	$ 24,077us-gaap_LoansAndLeasesReceivableAllowance
Provision for (recovery of) loan losses	1,146fcbc_AllowanceForRecoveryOfLoanAndLeaseLosses	1,590fcbc_AllowanceForRecoveryOfLoanAndLeaseLosses
Benefit attributable to the FDIC indemnification asset	(46)fcbc_ProvisionBenefitForLoanLosses	203fcbc_ProvisionBenefitForLoanLosses
Provision for (recovery of) loan losses charged to operations	1,100fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses	1,793fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses
Provision for (recovery of) loan losses recorded through the FDIC indemnification asset	46us-gaap_ProvisionForLoanAndLeaseLosses	(203)us-gaap_ProvisionForLoanAndLeaseLosses
Charge-offs	(1,578)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs	(2,216)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries	457us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	347us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Net charge-offs	(1,121)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet	(1,869)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
Ending balance	20,252us-gaap_LoansAndLeasesReceivableAllowance	23,798us-gaap_LoansAndLeasesReceivableAllowance
Allowance Excluding Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	20,169us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	23,322us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Provision for (recovery of) loan losses	1,090fcbc_AllowanceForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	1,852fcbc_AllowanceForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Provision for (recovery of) loan losses charged to operations	1,090fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	1,852fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Charge-offs	(1,578)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	(2,216)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Recoveries	457us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	347us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Net charge-offs	(1,121)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	(1,869)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Ending balance	20,138us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	23,305us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	58us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	755us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Provision for (recovery of) loan losses	56fcbc_AllowanceForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(262)fcbc_AllowanceForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Benefit attributable to the FDIC indemnification asset	(46)fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	203fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Provision for (recovery of) loan losses charged to operations	10fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(59)fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Provision for (recovery of) loan losses recorded through the FDIC indemnification asset	46us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(203)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Ending balance	$ 114us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	$ 493us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember

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Allowance for (Recovery of) Loan and Lease Losses

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(Provision) Benefit for Loan Losses

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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Amount, after recoveries, of loans and leases that have been written-off.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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