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Note 14 - 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, 2019 | Dec. 31, 2018
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Minimum [Member] |  |  |
Discount range, impaired loans | [1],[2] | 0.13 | 0.15
Discount range, non-covered OREO | [1],[2] | 0.1 | 0.01
Discount range, covered OREO | [1],[2] | 0.33 | 0.49
Maximum [Member] |  |  |
Discount range, impaired loans | [1],[2] | 0.37 | 1
Discount range, non-covered OREO | [1],[2] | 1 | 0.81
Discount range, covered OREO | [1],[2] | 0.42 | 0.49
Weighted Average [Member] |  |  |
Discount range, impaired loans | [1],[2] | (0.26) | (0.29)
Discount range, non-covered OREO | [1],[2] | (0.35) | (0.31)
Discount range, covered OREO | [1],[2] | (0.41) | (0.49)
[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 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

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: |

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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: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
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: |