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General - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Segment
Location
State
Oct. 24, 2014
Branch
Dec. 12, 2014
Branch
Dec. 31, 2014
Mar. 31, 2014
Summary Of Significant Accounting Policies [Line Items]          
Number of business segment 1us-gaap_NumberOfOperatingSegments        
Number of locations operated 63fcbc_NumberOfLocationsWhereEntityOperates        
Number of states operated 4us-gaap_NumberOfStatesInWhichEntityOperates        
Allocation of goodwill $ 100,810,000us-gaap_Goodwill     $ 100,722,000us-gaap_Goodwill  
Each share convertible into shares 69us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion        
Redemption of preferred stock, shares 2,367us-gaap_StockRedeemedOrCalledDuringPeriodShares        
Redemption of preferred stock 2,367,000us-gaap_StockRedeemedOrCalledDuringPeriodValue        
Series A Preferred Stock          
Summary Of Significant Accounting Policies [Line Items]          
Dividend Rate 6.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Number of preferred stock converted 12,784us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Redemption of preferred stock, shares 2,367us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Redemption of preferred stock 2,370,000us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Accrued and unpaid dividends 9,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Number of Series A Noncumulative Preferred Stock Shares 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
    15,151us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
15,151us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Bank of America          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches   7fcbc_NumberOfOperatingBranchesOfBank
/ us-gaap_BusinessAcquisitionAxis
= fcbc_BankOfAmericaMember
     
Deposit held on acquisition date by acquiree   318,880,000us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLiabilitiesRecognized
/ us-gaap_BusinessAcquisitionAxis
= fcbc_BankOfAmericaMember
     
Premium on deposits acquired   5,790,000fcbc_PremiumOnDepositsAcquired
/ us-gaap_BusinessAcquisitionAxis
= fcbc_BankOfAmericaMember
     
Loans recognized   0fcbc_BusinessCombinationSeparatelyRecognizedTransactionsLoansRecognized
/ us-gaap_BusinessAcquisitionAxis
= fcbc_BankOfAmericaMember
     
Bank of America | Southwestern Virginia          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches   6fcbc_NumberOfOperatingBranchesOfBank
/ us-gaap_BusinessAcquisitionAxis
= fcbc_BankOfAmericaMember
/ us-gaap_StatementGeographicalAxis
= fcbc_SouthwesternVirginiaMember
     
Bank of America | Central North Carolina          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches   1fcbc_NumberOfOperatingBranchesOfBank
/ us-gaap_BusinessAcquisitionAxis
= fcbc_BankOfAmericaMember
/ us-gaap_StatementGeographicalAxis
= fcbc_CentralNorthCarolinaMember
     
CresCom Bank          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches sold     13fcbc_NumberOfBranchesSold
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
   
Deposit assumed by the buyer     215,190,000fcbc_DisposalGroupIncludingDiscontinuedOperationCustomerDeposits
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
   
Loan assumed by the buyer     70,040,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
   
Net gain on branch divestiture     755,000us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
   
Deposit premium received     6,450,000fcbc_PremiumReceivedOnDepositAccountsDisposedOfInBranchSale
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
   
Allocation of goodwill     $ 6,450,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
   
CresCom Bank | Southeastern, Coastal region of North Carolina          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches sold     10fcbc_NumberOfBranchesSold
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
/ us-gaap_StatementGeographicalAxis
= stpr_NC
   
CresCom Bank | South Carolina          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches sold     3fcbc_NumberOfBranchesSold
/ us-gaap_BusinessAcquisitionAxis
= fcbc_CresComBankMember
/ us-gaap_StatementGeographicalAxis
= stpr_SC