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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 | 712,000,000 us-gaap_AssetsUnderManagementCarryingAmount |  |
Assets | 2,607,936,000 us-gaap_Assets | 2,602,514,000 us-gaap_Assets |
Number of business segment | 1 us-gaap_NumberOfOperatingSegments |  |
Carrying value and maximum potential loss exposure of VIEs | 1,260,000 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure | 2,890,000 us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure |
Special assets staff reviews loans, amount | 250,000 fcbc_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 | 250,000 fcbc_MinimumPrincipalBalanceOfLoansSubjectToReserveBasedOnCollateralOrNetPresentValueMethod |  |
TDRs subject to reserve based on historical loss rate | 250,000 fcbc_MaximumPrincipalBalanceOfLoansSubjectToReserveBasedOnHistoricalLossRate |  |
Operating lease term | 20 years |  |
Reporting units | 2 us-gaap_NumberOfReportableSegments |  |
Cash dividend Payment Period | 3 years |  |
Carrying value and maximum potential loss of equity investments | 360,000 us-gaap_EquityMethodInvestments | 786,000 us-gaap_EquityMethodInvestments |
Each share convertible into shares | 69 us-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 | 15,151 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 15,251 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 17,421 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Investment in FHLB of Atlanta |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Investment owned, at cost | 6,370,000 us-gaap_InvestmentOwnedAtCost / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember | 10,720,000 us-gaap_InvestmentOwnedAtCost / us-gaap_FairValueByAssetClassAxis = us-gaap_InvestmentInFederalHomeLoanBankStockMember |
FRB Richmond Stock |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Investment owned, at cost | 5,580,000 us-gaap_InvestmentOwnedAtCost / us-gaap_FairValueByAssetClassAxis = fcbc_FederalReserveBankOfRichmondMember | 5,580,000 us-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 | 53 fcbc_NumberOfOperatingBranchesOfBank / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember |  |
Number of states the company provides services | 4 us-gaap_NumberOfStatesInWhichEntityOperates / dei_LegalEntityAxis = fcbc_FirstCommunityBankMember |  |
GreenPoint Insurance Group |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations the Company provides services | 11 fcbc_NumberOfLocationsFromWhichEntityOperates / dei_LegalEntityAxis = fcbc_GreenpointInsuranceGroupMember |  |

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