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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	$ 105,455us-gaap_Goodwill	$ 104,866us-gaap_Goodwill	$ 83,056us-gaap_Goodwill
Acquisitions and dispositions, net	(6,454)fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet	148fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet	21,118fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet
Cash consideration paid	1,721us-gaap_GoodwillPurchaseAccountingAdjustments	441us-gaap_GoodwillPurchaseAccountingAdjustments	692us-gaap_GoodwillPurchaseAccountingAdjustments
Ending balance, December 31	100,722us-gaap_Goodwill	105,455us-gaap_Goodwill	104,866us-gaap_Goodwill
Community Banking
Goodwill [Line Items]
Beginning balance, January 1	96,541us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember	96,717us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember	75,599us-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	21,118fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember
Cash consideration paid	1,368us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember
Ending balance, December 31	91,455us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember	96,541us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember	96,717us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_CommunityBankingMember
Insurance Services
Goodwill [Line Items]
Beginning balance, January 1	8,914us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember	8,149us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember	7,457us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember
Acquisitions and dispositions, net		324fcbc_GoodwillAcquiredAndDisposedDuringPeriodNet / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember
Cash consideration paid	353us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember	441us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember	692us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember
Ending balance, December 31	$ 9,267us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember	$ 8,914us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember	$ 8,149us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fcbc_InsuranceServiceSegmentMember

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- Definition

Goodwill Acquired and Disposed During Period, Net

+ References

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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



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-Topic 350

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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

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-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

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-Section 25

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