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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]	Mar. 31, 2021
Minimum [Member]
Discount range, impaired loans	0
Discount range, non-covered OREO	0
Maximum [Member]
Discount range, impaired loans	53
Discount range, non-covered OREO	77
Weighted Average [Member]
Discount range, impaired loans	3
Discount range, non-covered OREO	29

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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: