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Note 12 - 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, 2025 | Dec. 31, 2024
--- | --- | ---
Collateral dependent assets with specific reserves | [1] | 0 |
Weighted Average [Member] |  |  |
Collateral dependent assets with specific reserves | [1],[2] | 0 | 0
OREO, measurement input | [1],[2] | 0.62 | 0.61
[1] | Fair value is generally based on appraisals of the underlying collateral.
[2] | Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.

X
- Definition The measurement input for collateral dependent assets with specific reserves. + References No definition available. + Details
Name: | fcbc_CollateralDependentAssetsWithSpecificReservesNoncoveredMeasurementInput
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

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- 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: |