Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Interest Income (Expense), Operating [Abstract]
Loans held for investment, net	$ 304,967	$ 306,142
Investment securities	113,527	118,535
Interest-bearing cash and federal funds sold	26,335	54,341
Margin balances	13,871	14,204
Financial instruments owned	6,546	4,860
Other	10,386	8,746
Total interest income	475,632	506,828
Bank deposits	193,123	230,064
Senior notes	7,131	12,506
Other	13,303	12,085
Total interest expense	$ 213,557	$ 254,655