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Note 14 - Other Operating Income and Expense (Details Textual)	12 Months Ended
	Dec. 31, 2017
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