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Note 4 - Credit Quality (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Percentage of Loan Loss Covered by FDIC	80.00%
Financing Receivable, Collectively Evaluated for Impairment	$ 1,718,888		$ 1,758,011
Loans Deemed to be Impaired, Threshold		$ 500		$ 250
Restructured Loans, Reserves	$ 250
Performing Status Returned Period	180 days
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0	$ 0
Impaired Loans [Member]
Financing Receivable, Collectively Evaluated for Impairment	24,410		25,270
Non-covered Loans [Member]
Financing Receivable, 90 Days or More Past Due, Still Accruing	156		58
Covered Loans [Member]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0		$ 0

X

- Definition

The quarterly review threshold for reviews of loans that are deemed to be impaired.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
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X

- Definition

Represents the percentage of loan covered by the FDIC.

+ References

No definition available.

+ Details

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X

- Definition

Represents the performing status return period.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount of reserves for restructured loans.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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X

- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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- Definition

Amount of financing receivable 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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- Details

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