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MORTGAGE SERVICING RIGHTS - Schedule of Expected Amortization of MSRs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
MSRs    
Future amortization    
2018 $ 119,086  
2019 103,959  
2020 91,878  
2021 79,650  
2022 64,735  
Thereafter 175,448  
Net carrying value 634,756 $ 521,930
Originated MSRs    
Future amortization    
2018 107,258  
2019 93,265  
2020 82,695  
2021 72,138  
2022 59,073  
Thereafter 158,255  
Net carrying value 572,684 450,260
Acquired MSRs    
Future amortization    
2018 11,828  
2019 10,694  
2020 9,183  
2021 7,512  
2022 5,662  
Thereafter 17,193  
Net carrying value $ 62,072 $ 71,670