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Interest Income and Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest Income Expense Net [Abstract]
Loans held for investment, net	$ 79,164	$ 95,881	$ 174,284	$ 189,105
Investment securities	41,527	61,716	89,664	127,182
Margin balances	6,364	13,663	16,495	27,103
Financial instruments owned	2,859	6,414	7,433	12,727
Other	(1,546)	10,266	1,669	22,894
Total interest income	128,368	187,940	289,545	379,011
Bank deposits	2,277	29,347	11,846	57,413
Senior notes	13,073	11,122	24,266	22,244
Federal Home Loan Bank advances	682	2,911	3,035	4,589
Other	(2,948)	9,511	(1,706)	18,093
Total interest expense	$ 13,084	$ 52,891	$ 37,441	$ 102,339

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Margin balances.

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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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Interest and fee income generated by loans the Entity intends and has the 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: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity.

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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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