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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]      
Assets managed by the Company 712,000,000us-gaap_AssetsUnderManagementCarryingAmount    
Assets 2,607,936,000us-gaap_Assets 2,602,514,000us-gaap_Assets  
Number of business segment 1us-gaap_NumberOfOperatingSegments    
Carrying value and maximum potential loss exposure of VIEs 1,260,000us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure 2,890,000us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure  
Special assets staff reviews loans, amount 250,000fcbc_MinimumPrincipalBalanceOfLoansForQuarterlyRatingReview    
Loan payments delinquency period beyond which loan is considered non-accrual 90 days    
TDRs evaluated for specific reserve based on collateral or net present value method 250,000fcbc_MinimumPrincipalBalanceOfLoansSubjectToReserveBasedOnCollateralOrNetPresentValueMethod    
TDRs subject to reserve based on historical loss rate 250,000fcbc_MaximumPrincipalBalanceOfLoansSubjectToReserveBasedOnHistoricalLossRate    
Operating lease term 20 years    
Reporting units 2us-gaap_NumberOfReportableSegments    
Cash dividend Payment Period 3 years    
Carrying value and maximum potential loss of equity investments 360,000us-gaap_EquityMethodInvestments 786,000us-gaap_EquityMethodInvestments  
Each share convertible into shares 69us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion    
Preferred stock redemption date May 20, 2016    
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 Series A Noncumulative Preferred Stock Shares 15,151us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
15,251us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
17,421us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Investment in FHLB of Atlanta      
Summary Of Significant Accounting Policies [Line Items]      
Investment owned, at cost 6,370,000us-gaap_InvestmentOwnedAtCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InvestmentInFederalHomeLoanBankStockMember
10,720,000us-gaap_InvestmentOwnedAtCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InvestmentInFederalHomeLoanBankStockMember
 
FRB Richmond Stock      
Summary Of Significant Accounting Policies [Line Items]      
Investment owned, at cost 5,580,000us-gaap_InvestmentOwnedAtCost
/ us-gaap_FairValueByAssetClassAxis
= fcbc_FederalReserveBankOfRichmondMember
5,580,000us-gaap_InvestmentOwnedAtCost
/ us-gaap_FairValueByAssetClassAxis
= fcbc_FederalReserveBankOfRichmondMember
 
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Loan delinquent period 30 days    
Long-term investments in various entities, ownership interests 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Long-term investments in various entities, ownership interests 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Furniture, Fixtures and Equipment | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful life 5 years    
Furniture, Fixtures and Equipment | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful life 10 years    
Software, Hardware, and Data Handling Equipment | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful life 3 years    
Software, Hardware, and Data Handling Equipment | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful life 5 years    
Building and Building Improvements | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful life 10 years    
Building and Building Improvements | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful life 40 years    
Land Improvements      
Summary Of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful life 20 years    
Consumer Loan      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 120 days    
Consumer Loan | Residential Real Estate      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 180 days    
Consumer Loan | Unsecured Loan      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 90 days    
Other Loans      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 120 days    
First Community Bank      
Summary Of Significant Accounting Policies [Line Items]      
Number of operating branches 53fcbc_NumberOfOperatingBranchesOfBank
/ dei_LegalEntityAxis
= fcbc_FirstCommunityBankMember
   
Number of states the company provides services 4us-gaap_NumberOfStatesInWhichEntityOperates
/ dei_LegalEntityAxis
= fcbc_FirstCommunityBankMember
   
GreenPoint Insurance Group      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations the Company provides services 11fcbc_NumberOfLocationsFromWhichEntityOperates
/ dei_LegalEntityAxis
= fcbc_GreenpointInsuranceGroupMember