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Aggregate Activity in Allowance For Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 24,077us-gaap_LoansAndLeasesReceivableAllowance	$ 25,770us-gaap_LoansAndLeasesReceivableAllowance	$ 26,205us-gaap_LoansAndLeasesReceivableAllowance
Removal of loans transferred	(682)us-gaap_AllowanceForLoanAndLeaseLossesLoansSold
Provision for (recovery of) loan losses	(277)us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired	8,659us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired
Benefit attributable to the FDIC indemnification asset	422fcbc_ProvisionBenefitForLoanLosses	(451)fcbc_ProvisionBenefitForLoanLosses
(Recovery of) provision for loan losses charged to operations	145fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses	8,208fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses	5,678fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses
Provision for (recovery of) loan losses recorded through the FDIC indemnification asset	422us-gaap_ProvisionForLoanAndLeaseLosses	451us-gaap_ProvisionForLoanAndLeaseLosses
Charge-offs	(6,481)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs	(12,527)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs	(7,504)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries	3,590us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	2,175us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	1,391us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Net charge-offs	(2,891)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet	(10,352)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet	(6,113)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
Ending balance	20,227us-gaap_LoansAndLeasesReceivableAllowance	24,077us-gaap_LoansAndLeasesReceivableAllowance	25,770us-gaap_LoansAndLeasesReceivableAllowance
Allowance Excluding Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	23,322us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	25,762us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	26,004us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Removal of loans transferred	(682)us-gaap_AllowanceForLoanAndLeaseLossesLoansSold / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Provision for (recovery of) loan losses	420us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	7,912us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
(Recovery of) provision for loan losses charged to operations	420fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	7,912fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	5,871fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Charge-offs	(6,481)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	(12,527)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	(7,504)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Recoveries	3,590us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	2,175us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	1,391us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Net charge-offs	(2,891)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	(10,352)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	(6,113)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Ending balance	20,169us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	23,322us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember	25,762us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AllowanceExcludingPurchasedCreditImpairedMember
Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	755us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	8us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	201us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Provision for (recovery of) loan losses	(697)us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	747us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Benefit attributable to the FDIC indemnification asset	422fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(451)fcbc_ProvisionBenefitForLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
(Recovery of) provision for loan losses charged to operations	(275)fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	296fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	(193)fcbc_ProvisionForRecoveryOfLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Provision for (recovery of) loan losses recorded through the FDIC indemnification asset	422us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	451us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember
Ending balance	$ 58us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	$ 755us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember	$ 8us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PurchasedCreditImpairedMember

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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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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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