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Summary of Information Related to OREO (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Other Real Estate Owned Activity [Line Items]
Non-covered OREO	$ 7,032us-gaap_OtherRealEstateNonCovered		$ 6,638us-gaap_OtherRealEstateNonCovered
Covered OREO	5,834us-gaap_OtherRealEstateCovered		6,324us-gaap_OtherRealEstateCovered
Total OREO	12,866us-gaap_OtherRealEstate		12,962us-gaap_OtherRealEstate
OREO secured by residential real estate	4,562fcbc_OtherRealEstateOwnedSecuredByResidentialRealEstate		6,155fcbc_OtherRealEstateOwnedSecuredByResidentialRealEstate
Residential real estate loans in the foreclosure process	$ 5,007fcbc_ResidentialRealEstateLoansInForeclosureProcess	[1]	$ 4,561fcbc_ResidentialRealEstateLoansInForeclosureProcess	[1]
[1] The recorded investment in consumer mortgage loans collateralized by residential real estate that are in the process of foreclosure according to local requirements of the applicable jurisdiction.

X

- Details

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- Definition

Other Real Estate Owned Secured by Residential Real Estate

+ References

No definition available.

+ Details

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X

- Definition

Residential Real Estate Loans in Foreclosure Process

+ References

No definition available.

+ Details

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- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ 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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- Definition

Carrying amount of other real estate covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount of other real estate not covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

+ References

No definition available.

+ Details

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