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Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis)

3 Months Ended

12 Months Ended

Mar. 31, 2015

Dec. 31, 2014

Impaired Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Valuation Technique

Discounted appraisals

^[1]

Unobservable Input

Appraisal adjustments

^[2]

OREO | Non Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Valuation Technique

Discounted appraisals

^[1]

Unobservable Input

Appraisal adjustments

^[2]

OREO | Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Valuation Technique

Discounted appraisals

^[1]

Unobservable Input

Appraisal adjustments

^[2]

Minimum | Impaired Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

8.00%us-gaap_FairValueInputsDiscountRate
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1.00%us-gaap_FairValueInputsDiscountRate
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Minimum | OREO | Non Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

10.00%us-gaap_FairValueInputsDiscountRate
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10.00%us-gaap_FairValueInputsDiscountRate
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= fcbc_NonCoveredLoansMember

Minimum | OREO | Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

2.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ fcbc_ScheduleOfFinancingReceivableAgingAxis
= fcbc_CoveredLoansMember

10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
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/ fcbc_ScheduleOfFinancingReceivableAgingAxis
= fcbc_CoveredLoansMember

Maximum | Impaired Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

69.00%us-gaap_FairValueInputsDiscountRate
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33.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Maximum | OREO | Non Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

60.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ fcbc_ScheduleOfFinancingReceivableAgingAxis
= fcbc_NonCoveredLoansMember

47.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ fcbc_ScheduleOfFinancingReceivableAgingAxis
= fcbc_NonCoveredLoansMember

Maximum | OREO | Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

43.00%us-gaap_FairValueInputsDiscountRate
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= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ fcbc_ScheduleOfFinancingReceivableAgingAxis
= fcbc_CoveredLoansMember

52.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_RangeAxis
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= fcbc_CoveredLoansMember

Average | Impaired Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

21.00%us-gaap_FairValueInputsDiscountRate
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22.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Average | OREO | Non Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

17.00%us-gaap_FairValueInputsDiscountRate
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= fcbc_OreoMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ fcbc_ScheduleOfFinancingReceivableAgingAxis
= fcbc_NonCoveredLoansMember

26.00%us-gaap_FairValueInputsDiscountRate
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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= fcbc_NonCoveredLoansMember

Average | OREO | Covered Loans

Fair Value Inputs, Assets, Quantitative Information [Line Items]

Weighted Average

33.00%us-gaap_FairValueInputsDiscountRate
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44.00%us-gaap_FairValueInputsDiscountRate
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[1]	Fair value is generally based on appraisals of the underlying collateral.
[2]	Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.

X

- Definition

Fair value disclosure unobservable input.

+ References

No definition available.

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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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X

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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