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Note 13 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - Measurement Input, Discount Rate [Member] - Valuation, Market Approach [Member]

Sep. 30, 2023

Dec. 31, 2022

Discount range, impaired loans

^[1],[2]

0.46

Weighted Average [Member]

Discount range, impaired loans

^[1],[2]

0.46

0.03

Discount range, non-covered OREO

^[1],[2]

0.86

0.69

[1]	Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.
[2]	Fair value is generally based on appraisals of the underlying collateral.

X

- Definition

The measurement input for non-covered impaired loans.

+ References

No definition available.

+ Details

Name:	fcbc_ImpairedLoansNoncoveredMeasurementInput
Namespace Prefix:	fcbc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The measurement input for non-covered other real estate owned.

+ References

No definition available.

+ Details

Name:	fcbc_OREONoncoveredMeasurementInput
Namespace Prefix:	fcbc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: