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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 11,721,000 |  | $ 4,116,000 |
Current Balance |  | 5,625,844,000 |  | 3,176,468,000 |
Recorded Investment in Loans, Total |  | 5,637,565,000 |  | 3,180,584,000 |
Non-accrual |  | 17,234,000 | [1] | 737,000 | [2]
Restructured |  | 9,700,000 | [1],[3] | 326,000 | [2]
Total |  | 26,934,000 | [1] | 1,063,000 | [2]
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 11,523,000 |  | 3,640,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 198,000 |  | 476,000 |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 1,710,399,000 |  | 1,216,656,000 |
Recorded Investment in Loans, Total |  | 1,710,399,000 |  | 1,216,656,000 |
Non-accrual | [1] | 16,815,000 |  |  |
Total | [1] | 16,815,000 |  |  |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 1,614,033,000 |  | 1,388,953,000 |
Recorded Investment in Loans, Total |  | 1,614,033,000 |  | 1,388,953,000 |
Consumer [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,000 |  | 14,000 |
Current Balance |  | 45,389,000 |  | 36,832,000 |
Recorded Investment in Loans, Total |  | 45,391,000 |  | 36,846,000 |
Non-accrual |  | 6,000 | [1] | 15,000 | [2]
Total |  | 6,000 | [1] | 15,000 | [2]
Consumer [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 7,000 |
Consumer [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,000 |  | 7,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,923,000 |  | 3,760,000 |
Current Balance |  | 2,159,477,000 |  | 425,372,000 |
Recorded Investment in Loans, Total |  | 2,161,400,000 |  | 429,132,000 |
Non-accrual | [2] |  |  | 380,000 |
Restructured |  | 178,000 | [1],[3] | 326,000 | [2]
Total |  | 178,000 | [1] | 706,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,923,000 |  | 3,310,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 450,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 9,522,000 |  |  |
Current Balance |  | 69,189,000 |  | 92,623,000 |
Recorded Investment in Loans, Total |  | 78,711,000 |  | 92,623,000 |
Restructured | [1],[3] | 9,522,000 |  |  |
Total | [1] | 9,522,000 |  |  |
Commercial Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 9,522,000 |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 274,000 |  | 342,000 |
Current Balance |  | 14,734,000 |  | 12,133,000 |
Recorded Investment in Loans, Total |  | 15,008,000 |  | 12,475,000 |
Non-accrual |  | 413,000 | [1] | 342,000 | [2]
Total |  | 413,000 | [1] | 342,000 | [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 78,000 |  | 323,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 196,000 |  | 19,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 12,623,000 |  | 3,899,000 |
Recorded Investment in Loans, Total |  | $ 12,623,000 |  | $ 3,899,000 |
[1] | There were no loans past due 90 days and still accruing interest at December 31, 2016.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2015.
[3] | On non-accrual status.

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