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Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Common stock held in employer stock fund	457,765us-gaap_CommonStockSharesHeldInEmployeeTrustShares	499,075us-gaap_CommonStockSharesHeldInEmployeeTrustShares	561,551us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Total Company expenses under the health plan	$ 2,880,000us-gaap_OtherPostretirementBenefitExpense	$ 3,020,000us-gaap_OtherPostretirementBenefitExpense	$ 2,250,000us-gaap_OtherPostretirementBenefitExpense
Deferred Compensation Liability	451,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability	455,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
Deferred compensation Expense	60,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense	60,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense	60,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
401 (k) Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Employer Matching Contributions	1,580,000fcbc_DefinedBenefitPlanEmployerMatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_EmployeesFourZeroOneKSavingsPlanMember	1,610,000fcbc_DefinedBenefitPlanEmployerMatchingContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_EmployeesFourZeroOneKSavingsPlanMember	1,270,000fcbc_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	6,630,000us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_SupplementalExecutiveRetirementPlanMember	5,620,000us-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	997,000us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fcbc_DirectorsPlanMember	975,000us-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	125,000fcbc_StopLossInsuranceLiability / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_IndividualMember
Aggregate
Defined Benefit Plan Disclosure [Line Items]
Stop Loss Insurance Liability	$ 4,060,000fcbc_StopLossInsuranceLiability / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = fcbc_AggregateMember

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Stop Loss Insurance Liability

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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

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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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.

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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

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The interest rate used to adjust for the time value of money for the plan.

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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.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance.

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-Publisher FASB

-Name Accounting Standards Codification

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