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Components of Other Operating Income and Expense (Parenthetical) (Detail)	12 Months Ended
	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