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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 5,787 |  | $ 11,721 |
Current Balance |  | 6,878,104 |  | 5,625,844 |
Recorded Investment in Loans, Total |  | 6,883,891 |  | 5,637,565 |
Non-Accrual |  | 6,074 | [1] | 17,234 | [2]
Restructured |  | 8,935 | [1],[3] | 9,700 | [2]
Total |  | 15,009 | [1] | 26,934 | [2]
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,785 |  | 11,523 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2 |  | 198 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,471 |  | 1,923 |
Current Balance |  | 2,512,072 |  | 2,159,477 |
Recorded Investment in Loans, Total |  | 2,517,543 |  | 2,161,400 |
Restructured |  | 173 | [1],[3] | 178 | [2]
Total |  | 173 | [1] | 178 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,471 |  | 1,923 |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 2,380,417 |  | 1,710,399 |
Recorded Investment in Loans, Total |  | 2,380,417 |  | 1,710,399 |
Non-Accrual |  | 5,749 | [1] | 16,815 | [2]
Restructured | [1],[3] | 8,762 |  |  |
Total |  | 14,511 | [1] | 16,815 | [2]
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 1,839,981 |  | 1,614,033 |
Recorded Investment in Loans, Total |  | 1,839,981 |  | 1,614,033 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 9,522 |
Current Balance |  | 78,614 |  | 69,189 |
Recorded Investment in Loans, Total |  | 78,614 |  | 78,711 |
Restructured | [2] |  |  | 9,522 |
Total | [2] |  |  | 9,522 |
Commercial Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 9,522 |
Consumer [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 316 |  | 2 |
Current Balance |  | 35,833 |  | 45,389 |
Recorded Investment in Loans, Total |  | 36,149 |  | 45,391 |
Non-Accrual |  | 3 | [1] | 6 | [2]
Total |  | 3 | [1] | 6 | [2]
Consumer [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 314 |  |  |
Consumer [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2 |  | 2 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 274 |
Current Balance |  | 13,072 |  | 14,734 |
Recorded Investment in Loans, Total |  | 13,072 |  | 15,008 |
Non-Accrual |  | 322 | [1] | 413 | [2]
Total |  | 322 | [1] | 413 | [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 78 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 196 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 18,115 |  | 12,623 |
Recorded Investment in Loans, Total |  | $ 18,115 |  | $ 12,623 |
[1] | There were no loans past due 90 days and still accruing interest at September 30, 2017.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2016.
[3] | On non-accrual status.

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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