Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest Income (Expense), Net [Abstract]
Loans held for investment, net	$ 208,366	$ 95,075	$ 480,054	$ 274,693
Investment securities	71,420	34,247	151,728	95,738
Margin balances	12,510	6,624	28,154	19,001
Financial instruments owned	3,564	3,581	13,041	9,019
Other	8,335	2,317	9,407	4,524
Total interest income	304,195	141,844	682,384	402,975
Senior notes	11,220	11,850	33,919	35,924
Bank deposits	43,371	1,111	47,899	3,608
Other	5,165	(2,938)	4,729	(891)
Total interest expense	$ 59,756	$ 10,023	$ 86,547	$ 38,641