Other Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Interest expense — portfolio related	$ 40,854	$ 34,561	$ 28,752	$ 23,556	$ 23,666	$ 20,321	$ 20,566	$ 20,832	$ 127,723	$ 85,386	$ 87,826
Interest expense — corporate debt	$ 4,139	$ 4,011	$ 4,182	$ 17,140	$ 4,462	$ 4,488	$ 4,309	$ 7,350	29,472	20,609	12,049
Total interest expense									157,195	105,995	99,875
Warehouse and Repurchase Facilities
Debt Instrument [Line Items]
Interest expense — portfolio related									17,454	9,706	8,352
Securitizations
Debt Instrument [Line Items]
Interest expense — portfolio related									$ 110,269	$ 75,680	$ 79,474