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MORTGAGE SERVICING RIGHTS - Schedule of Expected Amortization of MSRs (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
MSRs    
Future amortization    
Nine Months Ending December 31, 2018 $ 92,776  
2019 110,586  
2020 97,049  
2021 84,236  
2022 69,166  
2023 57,222  
Thereafter 119,996  
Net carrying value 631,031 $ 634,756
Originated MSRs    
Future amortization    
Nine Months Ending December 31, 2018 84,201  
2019 100,069  
2020 87,958  
2021 76,770  
2022 63,527  
2023 52,262  
Thereafter 107,766  
Net carrying value 572,553 572,684
Acquired MSRs    
Future amortization    
Nine Months Ending December 31, 2018 8,575  
2019 10,517  
2020 9,091  
2021 7,466  
2022 5,639  
2023 4,960  
Thereafter 12,230  
Net carrying value $ 58,478 $ 62,072