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

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- Definition Allowance for (Recovery of) Loan and Lease Losses + References No definition available. + Details
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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 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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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 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)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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