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Components of Other Operating Income (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014
Component of Operating Other Cost and Expense [Abstract]
Percentage of other operating income	1.00%fcbc_PercentageOfOperatingIncome

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

X

- Details

Name:	us-gaap_ComponentOfOperatingOtherCostAndExpenseLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration