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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] | Jun. 30, 2021
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Minimum [Member] |
Discount range, impaired loans | 0
Discount range, non-covered OREO | 0
Maximum [Member] |
Discount range, impaired loans | 37
Discount range, non-covered OREO | 77
Weighted Average [Member] |
Discount range, impaired loans | 11
Discount range, non-covered OREO | 31

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: |