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Interest Income and Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest Income Expense Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loans held for investment, net |  |  |  |  |  |  |  |  | $ 331,813 | $ 379,848 | $ 300,541
Investment securities |  |  |  |  |  |  |  |  | 149,915 | 231,021 | 252,200
Margin balances |  |  |  |  |  |  |  |  | 28,155 | 52,008 | 49,515
Financial instruments owned |  |  |  |  |  |  |  |  | 12,594 | 23,528 | 21,407
Other |  |  |  |  |  |  |  |  | 1,355 | 38,477 | 22,786
Total interest income |  |  |  |  |  |  |  |  | 523,832 | 724,882 | 646,449
Senior notes |  |  |  |  |  |  |  |  | 54,063 | 44,507 | 44,610
Bank deposits |  |  |  |  |  |  |  |  | 14,550 | 95,813 | 82,256
Federal Home Loan Bank advances |  |  |  |  |  |  |  |  | 3,667 | 7,872 | 15,173
Other |  |  |  |  |  |  |  |  | (6,502) | 29,739 | 28,037
Total interest expense | $ 14,515 | $ 13,822 | $ 13,084 | $ 24,357 | $ 31,448 | $ 44,144 | $ 52,891 | $ 49,448 | $ 65,778 | $ 177,931 | $ 170,076

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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