Revenue - Fees Collected (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 907,272	$ 801,275	$ 228,600
Collection agency fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	10,519	4,473	2,777
Borrower fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 25,208	$ 7,289	$ 2,093