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Components of Other Operating Income and Expense (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2016
Component Of Other Operating Income And Expense [Line Items] |
Percentage of other operating income | 1.00%

X
- Definition Component Of Other Operating Income And Expense [Line Items] + References No definition available. + Details
Name: | fcbc_ComponentOfOtherOperatingIncomeAndExpenseLineItems
Namespace Prefix: | fcbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Operating Income + References No definition available. + Details
Name: | fcbc_PercentageOfOperatingIncome
Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration