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Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets, net $ 9,566 $ 12,125
Core deposits [Member]    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets, net 7,675 9,675
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets, net 1,693 2,128
Non-compete agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets, net $ 198 $ 322