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Changes in Receivable from FDIC (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Changes in the receivable from the FDIC
Beginning balance	$ 34,691us-gaap_FDICIndemnificationAsset	$ 48,149us-gaap_FDICIndemnificationAsset
(Decrease) increase in estimated losses on covered loans	(422)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	451us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Increase in estimated losses on covered OREO	1,851us-gaap_RealEstateOwnedValuationAllowancePeriodIncreaseDecrease	4,425us-gaap_RealEstateOwnedValuationAllowancePeriodIncreaseDecrease
Reimbursable expenses from the FDIC	527fcbc_FdicIndemnificationReimbursableExpensesAccrued	1,574fcbc_FdicIndemnificationReimbursableExpensesAccrued
Net amortization	(3,979)us-gaap_FDICIndemnificationAssetNetWriteOffs	(5,597)us-gaap_FDICIndemnificationAssetNetWriteOffs
Reimbursements from the FDIC	(4,768)us-gaap_FDICIndemnificationAssetCashPaymentsReceived	(14,311)us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Ending balance	$ 27,900us-gaap_FDICIndemnificationAsset	$ 34,691us-gaap_FDICIndemnificationAsset

X

- Definition

FDIC indemnification reimbursable expenses accrued.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

+ References

No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

+ References

No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of decreases to the indemnification asset due to write offs of loans, net of recoveries, relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

+ References

No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAssetNetWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) in the allowance for credit losses related to financing receivables.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total Increase or Decrease in the real estate owned valuation allowance for period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration