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Note 5 - Credit Quality (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Percentage of Loan Loss Covered by FDIC	80.00%
Financing Receivable, Collectively Evaluated for Impairment	$ 1,785,574	$ 1,814,437
Restructured Loans, Reserves	$ 250
Performing Status Returned Period	180 days
Financing Receivable, Modifications, Recorded Investment	$ 9,663	14,236
Impaired Loans [Member]
Financing Receivable, Collectively Evaluated for Impairment	20,130	16,890
Non-covered Loans [Member]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1	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

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

X

- Definition

Represents the performing status return period.

+ References

No definition available.

+ Details

Name:	fcbc_PerformingStatusReturnedPeriod
Namespace Prefix:	fcbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of reserves for restructured loans.

+ References

No definition available.

+ Details

Name:	fcbc_RestructuredLoansReserves
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

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

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

+ Details

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

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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fcbc_NonCoveredLoansMember
Namespace Prefix:
Data Type:	na
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X

- Details

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Namespace Prefix:
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Period Type: