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Note 14 - Other Operating Income and Expense (Details Textual) | 12 Months Ended
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Dec. 31, 2018
Percentage of Operating Income | 1.00%

X
- Definition Represents the percentage of operating income that other components cannot exceed. + References No definition available. + Details
Name: | fcbc_PercentageOfOperatingIncome
Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration