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Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest Income Expense Net [Abstract]
Bank loans, net	$ 95,881	$ 68,389	$ 189,105	$ 132,024
Investment securities	61,716	63,535	127,182	118,438
Margin balances	13,663	12,306	27,103	23,256
Financial instruments owned	6,414	4,983	12,727	9,912
Other	10,266	5,208	22,894	8,525
Total interest income	187,940	154,421	379,011	292,155
Bank deposits	29,347	15,343	57,413	23,473
Senior notes	11,122	11,122	22,244	22,240
Federal Home Loan Bank advances	2,911	3,095	4,589	6,347
Other	9,511	7,719	18,093	11,672
Total interest expense	$ 52,891	$ 37,279	$ 102,339	$ 63,732

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Other interest and dividend income expense net.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and 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: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The aggregate interest expense incurred on all domestic deposits.

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Interest expense incurred during the reporting period on short-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances.

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