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MORTGAGE SERVICING RIGHTS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Bank Servicing        
Servicing Assets at Fair Value [Line Items]        
Service income fee $ 15.1 $ 27.7 $ 54.4 $ 82.9