Securitizations and Variable Interest Entities - Summary of Activity Related to Unconsolidated VIEs (Details) - Unconsolidated - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair value of consideration received:
Cash	$ 40,994	$ 0	$ 59,045	$ 5,320
Asset-backed securities retained	301,602	0	454,831	2,180
Other assets (liabilities)	3,790	0	6,089	(3,794)
Total consideration	346,386	0	519,965	3,706
Deconsolidation of debt	0	0	0	36,072
Fair value of loans sold	(343,142)	0	(514,701)	(39,519)
Gain on sales of loans	3,244	0	5,264	259
Cash proceeds from continuing involvement:
Servicing and other administrative fees	1,234	1,782	3,110	7,294
Interest received on asset-backed securities retained	$ 5,142	$ 1,294	$ 8,736	$ 6,373