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MORTGAGE SERVICING RIGHTS - Presentation of Activity Related to MSR (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]        
Fair value, beginning of period $ 227,400 $ 425,328 $ 378,078 $ 557,813
Changes in valuation inputs or assumptions 7,633 (17,312) (99,220) (116,150)
Other changes, including realization of expected cash flows (27,048) (21,965) (70,873) (55,612)
Fair value, end of period $ 207,985 $ 386,051 $ 207,985 $ 386,051