Revenue - Fees Collected (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 258,345	$ 187,297	$ 572,327	$ 303,467
Collection agency fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	2,565	991	4,555	1,854
Borrower fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 5,890	$ 1,095	$ 11,120	$ 1,980