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Note 4 - Credit Quality (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Percentage of Loan Loss Covered by FDIC	80.00%
Financing Receivable, Collectively Evaluated for Impairment	$ 1,801,111		$ 1,814,437
Financing Receivable, Modifications, Recorded Investment	9,759		14,236
Restructured Loans, Reserves	250
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	$ 0
Impaired Loans [Member]
Financing Receivable, Collectively Evaluated for Impairment	20,070		16,890
Non-covered Loans [Member]
Financing Receivable, Modifications, Recorded Investment			0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Covered Loans [Member]
Financing Receivable, Modifications, Recorded Investment	$ 0		$ 0

X

- Definition

Represents the percentage of loan covered by the FDIC.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amount of reserves for restructured loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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X

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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X

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

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- Details

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- Details

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- Details

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