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Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest Income (Expense), Operating [Abstract]
Loans held for investment, net	$ 316,551	$ 319,493	$ 932,153	$ 936,714
Investment securities	110,694	124,582	338,164	360,975
Interest-bearing cash and federal funds sold	24,086	36,684	71,206	128,842
Margin balances	15,510	13,710	43,744	41,870
Financial instruments owned	8,300	7,027	24,179	18,232
Other	6,363	9,327	24,746	29,170
Total interest income	481,504	510,823	1,434,192	1,515,803
Bank deposits	187,988	229,725	568,643	680,076
Senior notes	7,131	8,184	21,393	33,197
Other	10,050	13,283	35,490	39,903
Total interest expense	$ 205,169	$ 251,192	$ 625,526	$ 753,176

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Interest and fee income generated by loans the Entity intends and has the ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity.

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Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans generally are of short-duration (overnight).

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