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Interest Income And Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest Income Expense Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Bank loans, net |  |  |  |  |  |  |  |  | $ 300,541 | $ 206,084 | $ 127,923
Investment securities |  |  |  |  |  |  |  |  | 252,200 | 187,731 | 107,454
Margin balances |  |  |  |  |  |  |  |  | 49,515 | 37,218 | 32,147
Financial instruments owned |  |  |  |  |  |  |  |  | 21,407 | 17,563 | 18,965
Other |  |  |  |  |  |  |  |  | 22,786 | 5,785 | 7,843
Total interest income |  |  |  |  |  |  |  |  | 646,449 | 454,381 | 294,332
Bank deposits |  |  |  |  |  |  |  |  | 82,256 | 12,661 | 7,331
Senior notes |  |  |  |  |  |  |  |  | 44,610 | 35,338 | 36,217
Federal Home Loan Bank advances |  |  |  |  |  |  |  |  | 15,173 | 8,305 | 6,777
Other |  |  |  |  |  |  |  |  | 28,037 | 13,726 | 16,549
Total interest expense | $ 57,876 | $ 48,468 | $ 37,279 | $ 26,453 | $ 19,865 | $ 17,625 | $ 16,644 | $ 15,896 | $ 170,076 | $ 70,030 | $ 66,874

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- Definition 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. + 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=114873765&loc=SL114874048-224260 + Details
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