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Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased (Components Of Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | $ 925,045 | $ 749,443
U S Government Corporations And Agencies Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 89,833 | 116,949
Corporate Fixed Income Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 299,946 | 203,910
Corporate Equity Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 32,044 | 31,642
State and Municipal Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 159,095 | 112,983
U.S. Government Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 9,951 | 45,167
Mortgage Backed Securities [Member] | Agency Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 305,774 | 205,473
Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 28,402 | 33,319
Securities Sold, But Not yet Purchased [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 699,032 | 521,744
Securities Sold, But Not yet Purchased [Member] | U S Government Corporations And Agencies Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 20,549 |
Securities Sold, But Not yet Purchased [Member] | Corporate Fixed Income Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Fixed income securities | 202,968 | 255,700
Securities Sold, But Not yet Purchased [Member] | Corporate Equity Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities | 18,395 | 29,184
Securities Sold, But Not yet Purchased [Member] | State and Municipal Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
State and municipal securities | 31 |
Securities Sold, But Not yet Purchased [Member] | U.S. Government Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 362,536 | 186,030
Securities Sold, But Not yet Purchased [Member] | Mortgage Backed Securities [Member] | Agency Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 94,552 | 50,830
Securities Sold, But Not yet Purchased [Member] | Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 1 |
Securities Owned |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 925,045 | 749,443
Securities Owned | U S Government Corporations And Agencies Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 89,833 | 116,949
Securities Owned | Corporate Fixed Income Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Fixed income securities | 299,946 | 203,910
Securities Owned | Corporate Equity Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities | 32,044 | 31,642
Securities Owned | State and Municipal Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
State and municipal securities | 159,095 | 112,983
Securities Owned | U.S. Government Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 9,951 | 45,167
Securities Owned | Mortgage Backed Securities [Member] | Agency Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 305,774 | 205,473
Securities Owned | Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | $ 28,402 | $ 33,319

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- Definition Fair value of obligations arising from corporate debt obligations sold short. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42429-110968 + Details
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- Definition Fair value of obligations arising from state and municipal debt obligations sold short. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42429-110968 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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