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Interest Income and Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Income Expense Net [Abstract]                      
Loans held for investment, net                 $ 379,848 $ 300,541 $ 206,084
Investment securities                 231,021 252,200 187,731
Margin balances                 52,008 49,515 37,218
Financial instruments owned                 23,528 21,407 17,563
Other                 38,477 22,786 5,785
Total interest income                 724,882 646,449 454,381
Bank deposits                 95,813 82,256 12,661
Senior notes                 44,507 44,610 35,338
Federal Home Loan Bank advances                 7,872 15,173 8,305
Other                 29,739 28,037 13,726
Total interest expense $ 31,448 $ 44,144 $ 52,891 $ 49,448 $ 57,876 $ 48,468 $ 37,279 $ 26,453 $ 177,931 $ 170,076 $ 70,030