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Summary of Information Related to OREO (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Other Real Estate Owned Activity [Line Items]
Non-covered OREO		$ 5,313	$ 4,873
Covered OREO		2,279	4,034
Total OREO		7,592	8,907
Non-covered OREO secured by residential real estate		2,669	2,677
Residential real estate loans in the foreclosure process	[1]	$ 1,609	$ 2,727
[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.

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- Definition

Other Real Estate Owned Activity [Line Items]

+ References

No definition available.

+ Details

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- Definition

Other Real Estate Owned Secured by Residential Real Estate Non Covered

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No definition available.

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- Definition

Residential Real Estate Loans in Foreclosure Process

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No definition available.

+ Details

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Namespace Prefix:	fcbc_
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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.

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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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