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Interest Income and Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest Income Expense Net [Abstract]      
Loans held for investment, net $ 378,086 $ 331,813 $ 379,848
Investment securities 129,858 149,915 231,021
Margin balances 25,780 28,155 52,008
Financial instruments owned 15,041 12,594 23,528
Other (365) 1,355 38,477
Total interest income 548,400 523,832 724,882
Senior notes 47,500 54,063 44,507
Bank deposits 4,510 14,550 95,813
Other (6,012) (2,835) 37,611
Total interest expense $ 45,998 $ 65,778 $ 177,931