Revenue - Schedule of Collection Agency and Borrower Fees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 167,590	$ 146,755	$ 436,190	$ 407,585
Net gain (loss) on servicing rights and fair value adjustments	975	(3,063)	(513)	(4,800)
Servicing fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	21,782	26,113	66,975	82,611
Borrower fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	6,582	7,182	20,097	21,823
Collection agency fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	3,964	4,017	12,677	11,685
Other fees
Disaggregation of Revenue [Line Items]
Revenue from fees, net	88	69	301	407
Servicing and other fees, net
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 33,391	$ 34,318	$ 99,537	$ 111,726