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Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles, Customer Renewal Lists and Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 172,152 $ 136,711
Accumulated amortization (104,825) (91,067)
Net carrying amount 67,327 45,644
Core Deposit Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 139,886 111,594
Accumulated amortization (89,888) (79,362)
Net carrying amount 49,998 32,232
Customer Renewal Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 12,352 12,351
Accumulated amortization (8,544) (7,860)
Net carrying amount 3,808 4,491
Mortgage Servicing Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 19,914 12,766
Accumulated amortization (6,393) (3,845)
Net carrying amount $ 13,521 $ 8,921