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Employee Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Common stock held in employer stock fund | 457,765 us-gaap_CommonStockSharesHeldInEmployeeTrustShares | 499,075 us-gaap_CommonStockSharesHeldInEmployeeTrustShares | 561,551 us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Total Company expenses under the health plan | $ 2,880,000 us-gaap_OtherPostretirementBenefitExpense | $ 3,020,000 us-gaap_OtherPostretirementBenefitExpense | $ 2,250,000 us-gaap_OtherPostretirementBenefitExpense
Deferred Compensation Liability | 451,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability | 455,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |
Deferred compensation Expense | 60,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | 60,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | 60,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
401 (k) Savings Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Employer Matching Contributions | 1,580,000 fcbc_DefinedBenefitPlanEmployerMatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_EmployeesFourZeroOneKSavingsPlanMember | 1,610,000 fcbc_DefinedBenefitPlanEmployerMatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_EmployeesFourZeroOneKSavingsPlanMember | 1,270,000 fcbc_DefinedBenefitPlanEmployerMatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_EmployeesFourZeroOneKSavingsPlanMember
Defined Contribution Plan Employer Contribution Percentage | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_EmployeesFourZeroOneKSavingsPlanMember |  |
Supplemental Executive Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan Maximum Employee Contribution As Percentage Of Average Compensation | 35.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_SupplementalExecutiveRetirementPlanMember |  |
Defined Benefit Plan, Employee Contribution, Age | 62 years |  |
Defined benefit plan, actuarial obligation | 6,630,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_SupplementalExecutiveRetirementPlanMember | 5,620,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_SupplementalExecutiveRetirementPlanMember |
Defined benefit plan, actuarial obligation Loss | (651,000)us-gaap_DefinedBenefitPlanActuarialGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_SupplementalExecutiveRetirementPlanMember |  |
Defined benefit plan, actuarial discount rate assumption | 4.41%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_SupplementalExecutiveRetirementPlanMember | 5.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_SupplementalExecutiveRetirementPlanMember |
Directors Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Employee Contribution, Age | 70 years |  |
Defined benefit plan, actuarial obligation | 997,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_DirectorsPlanMember | 975,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_DirectorsPlanMember |
Defined benefit plan, actuarial discount rate assumption | 4.41%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_DirectorsPlanMember | 5.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_DirectorsPlanMember |
Defined Contribution Plan Maximum Employee Contribution As Percentage Of Base Salary | 100.00%fcbc_DefinedContributionPlanMaximumEmployeeContributionAsPercentageOfBaseSalary / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_DirectorsPlanMember |  |
Individual Counterparty |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Stop Loss Insurance Liability | 125,000 fcbc_StopLossInsuranceLiability / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_IndividualMember |  |
Aggregate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Stop Loss Insurance Liability | $ 4,060,000 fcbc_StopLossInsuranceLiability / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = fcbc_AggregateMember |  |

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- Definition Defined Benefit Plan, Employee Contribution, Age + References No definition available. + Details
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- Definition Defined Benefit Plan Employer Matching Contributions + References No definition available. + Details
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- Definition Defined Contribution Plan Maximum Employee Contribution As Percentage Of Base Salary + References No definition available. + Details
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- Definition Stop Loss Insurance Liability + References No definition available. + Details
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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16701-113920 + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6514294 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6749293 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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