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Note 5 - Allowance for Loan Losses - Allowance for Loan Losses on PCI Loans and Recorded Investment (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Acquired impaired loans evaluated for impairment	$ 39,662
Allowance for acquired impaired loans	0
Commercial Portfolio Segment [Member]
Acquired impaired loans evaluated for impairment	25,804
Allowance for acquired impaired loans	0
Commercial Portfolio Segment [Member] | Construction and Land Development [Member]
Acquired impaired loans evaluated for impairment	958
Allowance for acquired impaired loans	0
Commercial Portfolio Segment [Member] | Farmland and Other Agricultural [Member]
Acquired impaired loans evaluated for impairment	2,242
Allowance for acquired impaired loans	0
Commercial Portfolio Segment [Member] | Multifamily [Member]
Acquired impaired loans evaluated for impairment	1,614
Allowance for acquired impaired loans	0
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]
Acquired impaired loans evaluated for impairment	20,176
Allowance for acquired impaired loans	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Acquired impaired loans evaluated for impairment	814
Allowance for acquired impaired loans	0
Consumer Real Estate Portfolio Segment [Member]
Acquired impaired loans evaluated for impairment	13,858
Allowance for acquired impaired loans	0
Consumer Real Estate Portfolio Segment [Member] | 1-4 Family, Junior and HELOCS [Member]
Acquired impaired loans evaluated for impairment	761
Allowance for acquired impaired loans	0
Consumer Real Estate Portfolio Segment [Member] | 1-4 Family, Senior-consumer [Member]
Acquired impaired loans evaluated for impairment	12,494
Allowance for acquired impaired loans	0
Consumer Real Estate Portfolio Segment [Member] | Consumer Loan [Member]
Acquired impaired loans evaluated for impairment	603
Allowance for acquired impaired loans	$ 0

X

- Definition

Represents the amount of acquired impaired loans evaluated for impairment.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount of allowance for acquired impaired loans.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcbc_ConstructionAndLandDevelopmentMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcbc_FarmlandAndOtherAgriculturalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcbc_Multifamily1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcbc_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=fcbc_ConsumerRealEstatePortfolioSegmentMember
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Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcbc_OneFourFamilyJuniorAndHelocsMember
Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=fcbc_OneFourFamilySeniorConsumerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
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Period Type: