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Carrying and Contractual Unpaid Principal Balance of PCI loans, by Acquisition (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid principal, ending balance | $ 20,452 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | $ 16,660 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance |
PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 59,935 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 62,283 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 81,711 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Carrying value, ending balance | 59,935 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 62,283 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 81,711 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Unpaid principal, ending balance | 97,287 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 101,711 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember |
Peoples | PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 6,954 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 7,090 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 9,196 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Carrying value, ending balance | 6,954 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 7,090 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 9,196 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Unpaid principal, ending balance | 12,353 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 13,669 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_PeoplesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember |
Waccamaw Bank | PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 51,649 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 53,835 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 70,584 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Carrying value, ending balance | 51,649 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 53,835 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 70,584 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Unpaid principal, ending balance | 83,559 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 86,641 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_WaccamawBankMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember |
Other | PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 1,332 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 1,358 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 1,931 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Carrying value, ending balance | 1,332 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 1,358 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | 1,931 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember
Unpaid principal, ending balance | $ 1,375 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember | $ 1,401 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_OthersMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_PurchasedCreditImpairedLoansMember |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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