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Changes in Residential and Participation Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Carrying value, beginning of year $ 243,389  
Carrying value, end of period 228,099 $ 243,389
Mortgage Servicing Rights Residential    
Finite-Lived Intangible Assets [Line Items]    
Carrying value, beginning of year [1] 243,389 227,297
Additions 45,588 48,990 [1]
Due to changes in interest rates 3,341 11,981 [1]
Due to model assumption changes [2] (13,088) (1,506) [1]
Due to loan payoffs (33,425) (27,288) [1]
Due to passage of time and other changes (17,706) (16,085) [1]
Carrying value, end of period 228,099 243,389 [1]
Mortgage Servicing Rights Participation    
Finite-Lived Intangible Assets [Line Items]    
Carrying value, beginning of year [1] 4,345  
Additions 3,774 5,063 [1]
Amortization (2,257) (718) [1]
Carrying value, end of period $ 5,862 $ 4,345 [1]
[1] The presentation of the 2015 amounts has been modified to conform with the 2016 presentation.
[2] Represents changes in fair value driven by changes to the inputs to the valuation model related to assumed prepayment speeds.