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Components of Other Operating Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Component of Operating Other Cost and Expense [Abstract]                      
Miscellaneous income                 $ 429us-gaap_OtherIncome $ 411us-gaap_OtherIncome $ 2,459us-gaap_OtherIncome
Other                 3,926fcbc_OtherMiscellaneousIncome [1] 4,824fcbc_OtherMiscellaneousIncome [1] 4,283fcbc_OtherMiscellaneousIncome [1]
Total other operating income $ 9,189us-gaap_OtherOperatingIncome $ 7,347us-gaap_OtherOperatingIncome $ 7,663us-gaap_OtherOperatingIncome $ 7,189us-gaap_OtherOperatingIncome $ 6,743us-gaap_OtherOperatingIncome $ 8,150us-gaap_OtherOperatingIncome $ 6,735us-gaap_OtherOperatingIncome $ 7,744us-gaap_OtherOperatingIncome $ 4,355us-gaap_OtherOperatingIncome $ 5,235us-gaap_OtherOperatingIncome $ 6,742us-gaap_OtherOperatingIncome
[1] Other components of other operating income that do not exceed 1% of total income.