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MORTGAGE SERVICING RIGHTS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Bank Servicing        
Servicing Assets at Fair Value [Line Items]        
Service income fee $ 16.4 $ 27.5 $ 39.2 $ 55.2