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Interest Income and Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Interest Income (Expense), Net [Abstract]    
Loans held for investment, net $ 306,142 $ 295,052
Investment securities 118,535 108,327
Interest-bearing cash and federal funds sold 54,341 22,725
Margin balances 14,204 14,871
Financial instruments owned 4,860 3,721
Other 8,746 6,868
Total interest income 506,828 451,564
Bank deposits 230,064 137,288
Senior notes 12,506 12,506
Other 12,085 5,204
Total interest expense $ 254,655 $ 154,998