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Acquisitions and Divestitures - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | May 31, 2012 Branch | Jun. 08, 2012 Branch | Oct. 24, 2014 Branch | Dec. 12, 2014 Branch | Dec. 31, 2013 Entity | Dec. 31, 2012 | Dec. 31, 2011
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Additions to goodwill | $ 100,722,000 us-gaap_Goodwill |  |  |  |  | $ 105,455,000 us-gaap_Goodwill | $ 104,866,000 us-gaap_Goodwill | $ 83,056,000 us-gaap_Goodwill
Net gain on branch divestiture | 755,000 us-gaap_GainLossOnSaleOfBusiness |  |  |  |  |  |  |
Peoples Bank of Virginia |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating branches |  | 4 fcbc_NumberOfOperatingBranchesOfBank / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Assets held on acquisition date by acquiree |  | 275,760,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Loans |  | 184,840,000 fcbc_BusinessCombinationSeparatelyRecognizedTransactionsLoansRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Deposit held on acquisition date by acquiree |  | 232,750,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLiabilitiesRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Cash consideration |  | 40,280,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Common stock valued |  | 26,470,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Total cash consideration of common stock |  | 12,260,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Common stock issued |  | 2,157,005 us-gaap_StockIssuedDuringPeriodSharesIssuedForNoncashConsideration / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Market price of common stock |  | $ 12.27 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Cash received |  | $ 6.08 fcbc_CashPaymentPerShareOnAcquisition / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Common stock |  | $ 1.07 fcbc_ShareIssuablePerShareOnAcquisition / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Additions to goodwill |  | 10,320,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcbc_PeoplesBankOfVirginiaMember |  |  |  |  |  |
Waccamaw Bank |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating branches |  |  | 16 fcbc_NumberOfOperatingBranchesOfBank / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  |  |  |
Assets held on acquisition date by acquiree |  |  | 500,640,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  |  |  |
Loans |  |  | 318,350,000 fcbc_BusinessCombinationSeparatelyRecognizedTransactionsLoansRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  |  |  |
Deposit held on acquisition date by acquiree |  |  | 414,130,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLiabilitiesRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  |  |  |
Additions to goodwill |  |  | 10,620,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  |  |  |
FDIC loan and foreclosed real estate losses | 80.00%fcbc_PercentageOfLossCoveredByFdic / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  | 80.00%fcbc_PercentageOfLossCoveredByFdic / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  |  |  |
Indemnification asset recorded at acquisition |  |  | 49,760,000 us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate / us-gaap_BusinessAcquisitionAxis = fcbc_WaccamawBankMember |  |  |  |  |
Bank of America |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating branches |  |  |  | 7 fcbc_NumberOfOperatingBranchesOfBank / us-gaap_BusinessAcquisitionAxis = fcbc_BankOfAmericaMember |  |  |  |
Loans |  |  |  | 0 fcbc_BusinessCombinationSeparatelyRecognizedTransactionsLoansRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_BankOfAmericaMember |  |  |  |
Deposit held on acquisition date by acquiree |  |  |  | 318,880,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLiabilitiesRecognized / us-gaap_BusinessAcquisitionAxis = fcbc_BankOfAmericaMember |  |  |  |
Premium on deposits acquired |  |  |  | 5,790,000 fcbc_PremiumOnDepositsAcquired / us-gaap_BusinessAcquisitionAxis = fcbc_BankOfAmericaMember |  |  |  |
Bank of America | Southwestern Virginia |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating branches |  |  |  | 6 fcbc_NumberOfOperatingBranchesOfBank / us-gaap_BusinessAcquisitionAxis = fcbc_BankOfAmericaMember / us-gaap_StatementGeographicalAxis = fcbc_SouthwesternVirginiaMember |  |  |  |
Bank of America | Central North Carolina |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating branches |  |  |  | 1 fcbc_NumberOfOperatingBranchesOfBank / us-gaap_BusinessAcquisitionAxis = fcbc_BankOfAmericaMember / us-gaap_StatementGeographicalAxis = fcbc_CentralNorthCarolinaMember |  |  |  |
CresCom Bank |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Additions to goodwill |  |  |  |  | 6,450,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember |  |  |
Number of operating branches sold |  |  |  |  | 13 fcbc_NumberOfBranchesSold / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember |  |  |
Deposit assumed by the buyer |  |  |  |  | 215,190,000 fcbc_DisposalGroupIncludingDiscontinuedOperationCustomerDeposits / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember |  |  |
Loan assumed by the buyer |  |  |  |  | 70,040,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember |  |  |
Net gain on branch divestiture |  |  |  |  | 755,000 us-gaap_GainLossOnSaleOfBusiness / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember |  |  |
Deposit premium received |  |  |  |  | 6,450,000 fcbc_PremiumReceivedOnDepositAccountsDisposedOfInBranchSale / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember |  |  |
CresCom Bank | Southeastern, coastal region of North Carolina |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating branches sold |  |  |  |  | 10 fcbc_NumberOfBranchesSold / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember / us-gaap_StatementGeographicalAxis = fcbc_NorthCarolinaMember |  |  |
CresCom Bank | South Carolina |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of operating branches sold |  |  |  |  | 3 fcbc_NumberOfBranchesSold / us-gaap_BusinessAcquisitionAxis = fcbc_CresComBankMember / us-gaap_StatementGeographicalAxis = stpr_SC |  |  |
Insurance Services |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  | 150,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = fcbc_InsuranceServiceSegmentMember |  |
Number of insurance agencies acquired |  |  |  |  |  | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = fcbc_InsuranceServiceSegmentMember |  |
Additional cash consideration |  |  |  |  |  | 253,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = fcbc_InsuranceServiceSegmentMember |  |
Goodwill and intangible asset added from acquisition |  |  |  |  |  | 324,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = fcbc_InsuranceServiceSegmentMember |  |
Earn-out payments related to acquisitions | $ 353,000 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = fcbc_InsuranceServiceSegmentMember |  |  |  |  | $ 442,000 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = fcbc_InsuranceServiceSegmentMember | $ 692,000 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = fcbc_InsuranceServiceSegmentMember |

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