Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest Income (Expense), Operating [Abstract]
Loans held for investment, net	$ 1,250,048	$ 1,253,008	$ 752,273
Investment securities	484,134	467,199	247,755
Interest-bearing cash and federal funds sold	164,110	123,363	29,996
Margin balances	55,156	61,138	43,751
Financial instruments owned	25,001	16,726	20,545
Other	38,015	34,311	4,795
Total interest income	2,016,464	1,955,745	1,099,115
Bank deposits	888,453	724,857	146,636
Senior notes	40,349	50,025	44,424
Other	52,564	35,454	10,327
Total interest expense	$ 981,366	$ 810,336	$ 201,387