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Nonaccrual Loans by Loan Class (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total | $ 12,994 fcbc_GrossNonaccrualLoans | $ 22,506 fcbc_GrossNonaccrualLoans
Purchased impaired loans |  | 8 fcbc_AcquiredImpairedLoans
Total nonaccrual loans | 12,994 fcbc_NetNonaccrualLoans | 22,514 fcbc_NetNonaccrualLoans
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 18 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 1,948 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 157 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 5,433 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 245 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_MultiFamilyResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 678 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 2,188 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 3,651 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 2,685 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Loans | Agricultural |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 4 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AgriculturalMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 742 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_FarmlandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 996 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 997 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 7,071 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 8,122 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 106 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember | 190 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember
Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 68 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherPortfolioSegmentMember | 201 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherPortfolioSegmentMember
Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 10,556 fcbc_GrossNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 19,153 fcbc_GrossNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Purchased impaired loans |  | 8 fcbc_AcquiredImpairedLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Total nonaccrual loans | 10,556 fcbc_NetNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 19,161 fcbc_NetNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 1,187 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 123 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 5,341 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 245 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_MultiFamilyResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember |
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 601 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 1,966 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 2,334 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 2,685 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 4 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_AgriculturalMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember |
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 441 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_FarmlandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 792 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 765 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 6,389 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 6,567 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 68 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember | 201 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerAndOtherPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 2,438 fcbc_GrossNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | 3,353 fcbc_GrossNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Total nonaccrual loans | 2,438 fcbc_NetNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | 3,353 fcbc_NetNonaccrualLoans / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 18 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | 761 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_ConstructionDevelopmentAndOtherLandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 34 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | 92 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 77 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | 222 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyNonOwnerOccupiedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 1,317 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_NonFarmNonResidentialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember |
Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 301 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_FarmlandMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 204 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | 232 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 682 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | 1,555 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcbc_SingleFamilyOwnerOccupiedLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Covered Loans | Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total | $ 106 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember | $ 190 fcbc_GrossNonaccrualLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_PrincipalOwnerMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcbc_ConsumerRealEstateMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember

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