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MORTGAGE SERVICING RIGHTS - Schedule of Expected Amortization of MSRs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
MSRs    
Future amortization    
2017 $ 105,015  
2018 90,319  
2019 78,288  
2020 68,771  
2021 57,756  
Thereafter 121,781  
Net carrying value 521,930 $ 412,348
Originated MSRs    
Future amortization    
2017 90,304  
2018 78,092  
2019 67,493  
2020 59,847  
2021 50,738  
Thereafter 103,786  
Net carrying value 450,260 364,265
Acquired MSRs    
Future amortization    
2017 14,711  
2018 12,227  
2019 10,795  
2020 8,924  
2021 7,018  
Thereafter 17,995  
Net carrying value $ 71,670 $ 48,083