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Interest Income and Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Interest Income (Expense), Operating [Abstract]        
Loans held for investment, net $ 319,493 $ 320,715 $ 936,714 $ 928,801
Investment securities 124,582 120,670 360,975 345,201
Interest-bearing cash and federal funds sold 36,684 35,560 128,842 83,280
Margin balances 13,710 15,651 41,870 45,874
Financial instruments owned 7,027 4,402 18,232 12,754
Other 9,327 8,200 29,170 23,622
Total interest income 510,823 505,198 1,515,803 1,439,532
Bank deposits 229,725 198,197 680,076 506,847
Senior notes 8,184 12,507 33,197 37,519
Other 13,283 9,832 39,903 22,258
Total interest expense $ 251,192 $ 220,536 $ 753,176 $ 566,624