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Note 13 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - Valuation, Market Approach [Member] | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Unobservable Input | [1] | Appraisal adjustments(2) |
Minimum [Member] | Measurement Input, Discount Rate [Member] |  |  |
Discount range, impaired loans |  | 0.07 | 0.06
Discount range, non-covered OREO |  | 0.1 | 0.08
Discount range, covered OREO |  | 0.49 | 0
Maximum [Member] | Measurement Input, Discount Rate [Member] |  |  |
Discount range, impaired loans |  | 1 | 0.79
Discount range, non-covered OREO |  | 1 | 0.47
Discount range, covered OREO |  | 0.49 | 0.65
Weighted Average [Member] | Measurement Input, Discount Rate [Member] |  |  |
Discount range, impaired loans |  | 0.35 | 0.34
Discount range, non-covered OREO |  | 0.31 | 0.32
Discount range, covered OREO |  | 0.49 | 0.52
[1] | Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.

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- Definition Description of unobservable input used to measure fair value. + References No definition available. + Details
Name: | fcbc_FairValueDisclosureUnobservableInput
Namespace Prefix: | fcbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Definition The measurement input for covered other real estate owned. + References No definition available. + Details
Name: | fcbc_OREOCoveredMeasurementInput
Namespace Prefix: | fcbc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- 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: |

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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