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Activity in Goodwill, by Reporting Unit (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
Beginning balance, January 1 | $ 105,455 us-gaap_Goodwill | $ 104,866 us-gaap_Goodwill | $ 83,056 us-gaap_Goodwill
Acquisitions and dispositions, net | (6,454)fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet | 148 fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet | 21,118 fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet
Cash consideration paid | 1,721 us-gaap_GoodwillPurchaseAccountingAdjustments | 441 us-gaap_GoodwillPurchaseAccountingAdjustments | 692 us-gaap_GoodwillPurchaseAccountingAdjustments
Ending balance, December 31 | 100,722 us-gaap_Goodwill | 105,455 us-gaap_Goodwill | 104,866 us-gaap_Goodwill
Community Banking |  |  |
Goodwill [Line Items] |  |  |
Beginning balance, January 1 | 96,541 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember | 96,717 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember | 75,599 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember
Acquisitions and dispositions, net | (6,454)fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember | (176)fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember | 21,118 fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember
Cash consideration paid | 1,368 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember |  |
Ending balance, December 31 | 91,455 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember | 96,541 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember | 96,717 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember
Insurance Services |  |  |
Goodwill [Line Items] |  |  |
Beginning balance, January 1 | 8,914 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember | 8,149 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember | 7,457 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember
Acquisitions and dispositions, net |  | 324 fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember |
Cash consideration paid | 353 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember | 441 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember | 692 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember
Ending balance, December 31 | $ 9,267 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember | $ 8,914 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember | $ 8,149 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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