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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |
Net increase in related party deposit | $ 423 us-gaap_IncreaseDecreaseInOtherDeposits | $ 574 us-gaap_IncreaseDecreaseInOtherDeposits | $ 1,559 us-gaap_IncreaseDecreaseInOtherDeposits
Loan to related parties, Increase (decreases) | 5,645 us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease | 564 us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease | (1,789)us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease
Related party fees | 27 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | 57 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty | 63 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Lease expense | 1,060 us-gaap_OperatingLeasesRentExpenseNet | 1,180 us-gaap_OperatingLeasesRentExpenseNet | 1,260 us-gaap_OperatingLeasesRentExpenseNet
Related Parties |  |  |
Related Party Transaction [Line Items] |  |  |
Lease expense | 92 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = fcbc_RelatedPartiesMember | 134 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = fcbc_RelatedPartiesMember | 171 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = fcbc_RelatedPartiesMember
Subsidiary Board Members and Executive Officers |  |  |
Related Party Transaction [Line Items] |  |  |
Net increase in related party deposit | 481 us-gaap_IncreaseDecreaseInOtherDeposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember | 103 us-gaap_IncreaseDecreaseInOtherDeposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember | 166 us-gaap_IncreaseDecreaseInOtherDeposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember
Loan to related parties, Increase (decreases) | $ 5,470 us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember | $ (613)us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember | $ (2,790)us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember

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- Definition Net cash inflow or outflow in all other deposits that have not otherwise been stated in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 + Details
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Period Type: | duration

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- Definition Reflects the sum for the period of the additions and reductions to related party loans, which when added to the opening balance of related party loan will agree to the ending balance of such loans. This subtotal typically is not reflected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 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(e)) -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 e -Article 9 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Details
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- Details
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