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Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased (Tables) | 3 Months Ended
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Mar. 31, 2018
Trading Securities Balance Sheet Reported Amounts [Abstract] |
Components Of Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased | The components of financial instruments owned and financial instruments sold, but not yet purchased, at March 31, 2018 and December 31, 2017 are as follows (in thousands):
|  | March 31, 2018 |  |  | December 31, 2017 |
Financial instruments owned: |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 21,087 |  |  | $ | 13,466 |
U.S. government agency securities |  |  | 111,921 |  |  |  | 147,223 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
Agency |  |  | 361,747 |  |  |  | 302,445 |
Non-agency |  |  | 29,081 |  |  |  | 29,356 |
Asset-backed securities |  |  | 85,987 |  |  |  | 76,752 |
Corporate securities: |  |  |  |  |  |  |  |
Fixed income securities |  |  | 364,917 |  |  |  | 325,471 |
Equity securities |  |  | 39,090 |  |  |  | 46,802 |
Sovereign debt |  |  | 19,341 |  |  |  | 32,470 |
State and municipal securities |  |  | 147,876 |  |  |  | 169,699 |
|  | $ | 1,181,047 |  |  | $ | 1,143,684 |
Financial instruments sold, but not yet purchased: |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 527,073 |  |  | $ | 442,402 |
U.S. government agency securities |  |  | 20,618 |  |  |  | 10,348 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
Agency |  |  | 144,169 |  |  |  | 86,612 |
Corporate securities: |  |  |  |  |  |  |  |
Fixed income securities |  |  | 223,865 |  |  |  | 180,755 |
Equity securities |  |  | 20,235 |  |  |  | 38,510 |
Sovereign debt |  |  | 23,575 |  |  |  | 20,236 |
|  | $ | 959,535 |  |  | $ | 778,863 |

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- Definition Tabular disclosure of financial instruments held by a broker-dealer for its own account (proprietary securities) for trading or investment purposes that are carried at fair value including securities sold, not yet purchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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