Revenue - Fees Collected (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 179,348	$ 210,421	$ 751,675	$ 513,888
Collection agency fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	2,790	1,214	7,345	3,068
Borrower fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 7,005	$ 2,062	$ 18,125	$ 4,043