Borrowings - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Borrowings [Line Items]
Total payments due	$ 869,373	$ 709,787
Unamortized debt discount	(12,818)	(14,355)
Total borrowings	856,555	695,432
Warehouse credit facilities | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Total payments due	208,123	48,030
Risk retention funding loan
Schedule of Borrowings [Line Items]
Total payments due	0	507
Convertible senior notes
Schedule of Borrowings [Line Items]
Total payments due	$ 661,250	$ 661,250