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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of General and Administrative Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]      
Legal and professional $ 102,114 $ 70,502 $ 89,489
Loan origination 196,989 92,081 59,418
Occupancy 70,616 36,799 19,388
Subservicing 224,138 201,444 227,482
Loan servicing 16,440 14,126 31,737
Property and maintenance 69,083 42,508 8,112
Other 184,648 90,981 60,855
General and administrative $ 864,028 $ 548,441 $ 496,481