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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance, beginning of period $ 74,244 $ 74,244
Addition from the CCB acquisition 15,289 0
Balance, end of period $ 89,533 $ 74,244