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Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	$ 3,054us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	$ 6,480us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
OREO | Non Covered Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	1,505us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember	5,462us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
OREO | Covered Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	974us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember	5,247us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember
Level 3 | Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	3,054us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	6,480us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 3 | OREO | Non Covered Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	1,505us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember	5,462us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_NonCoveredLoansMember
Level 3 | OREO | Covered Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Fair value	$ 974us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember	$ 5,247us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / fcbc_ScheduleOfFinancingReceivableAgingAxis = fcbc_CoveredLoansMember

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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 (a)

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

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