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Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value on Nonrecurring Basis, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Impaired Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Fair value | $ 6,480 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 8,935 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
OREO | Not covered by loss share agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Fair value | 5,462 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioOneMember | 7,180 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioOneMember
OREO | Covered by loss share agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Fair value | 5,247 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioTwoMember | 6,433 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioTwoMember
Level 3 | Impaired Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Fair value | 6,480 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 8,935 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Level 3 | OREO | Not covered by loss share agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Fair value | 5,462 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioOneMember | 7,180 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioOneMember
Level 3 | OREO | Covered by loss share agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Fair value | $ 5,247 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioTwoMember | $ 6,433 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcbc_OreoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_StatementScenarioAxis = fcbc_ScenarioTwoMember

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- 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 + Details
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