Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of General and Administrative Expenses (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of General and Administrative Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Other Income [Line Items]      
Legal and professional expense $ 70,502 $ 89,489 $ 45,234
Loan origination expense 92,081 45,483 6,820
Occupancy expense 36,799 19,388 8,868
Subservicing expense 201,444 227,482 176,784
Loan servicing expense 14,126 31,737 43,547
Property and maintenance expense 42,508 8,112 0
Other 90,981 74,791 50,763
General and administrative expense 1,120,087 781,971 441,886
Servicing      
Schedule Of Other Income [Line Items]      
Compensation and benefits expense 230,009 121,004 47,084
Origination      
Schedule Of Other Income [Line Items]      
Compensation and benefits expense $ 341,637 $ 164,485 $ 62,786