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

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- Definition (Provision) Benefit for Loan Losses + References No definition available. + Details
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- Definition Provision for (Recovery of) Loan and Lease Losses + References No definition available. + Details
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- Definition Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount, after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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