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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, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 136,711 $ 131,254
Accumulated amortization (91,067) (83,750)
Core deposit intangibles, Total 45,644 47,504
Core Deposit Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 111,594 108,593
Accumulated amortization (79,362) (71,818)
Core deposit intangibles, Total 32,232 36,775
Customer Renewal Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 12,351 10,970
Accumulated amortization (7,860) (7,099)
Core deposit intangibles, Total 4,491 3,871
Mortgage Servicing Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 12,766 11,691
Accumulated amortization (3,845) (4,833)
Core deposit intangibles, Total $ 8,921 $ 6,858