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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due | $ 14,469 |  | $ 11,721 |  |
Current Balance | 5,909,155 |  | 5,625,844 |  |
Recorded Investment in Loans, Total | 5,923,624 |  | 5,637,565 |  | $ 3,505,509
Non-Accrual | 18,338 | [1] | 17,234 | [2] |
Restructured | 9,698 | [1],[3] | 9,700 | [2] |
Total | 28,036 | [1] | 26,934 | [2] |
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due | 4,761 |  | 11,523 |  |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due | 9,708 |  | 198 |  |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due | 761 |  | 1,923 |  |
Current Balance | 2,213,595 |  | 2,159,477 |  |
Recorded Investment in Loans, Total | 2,214,356 |  | 2,161,400 |  | 730,683
Restructured | 176 | [1],[3] | 178 | [2] |
Total | 176 | [1] | 178 | [2] |
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due | 761 |  | 1,923 |  |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance | 1,830,865 |  | 1,710,399 |  |
Recorded Investment in Loans, Total | 1,830,865 |  | 1,710,399 |  | 1,295,318
Non-Accrual | 18,010 | [1] | 16,815 | [2] |
Total | 18,010 | [1] | 16,815 | [2] |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance | 1,728,516 |  | 1,614,033 |  |
Recorded Investment in Loans, Total | 1,728,516 |  | 1,614,033 |  | 1,345,719
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due | 13,522 |  | 9,522 |  |
Current Balance | 65,000 |  | 69,189 |  |
Recorded Investment in Loans, Total | 78,522 |  | 78,711 |  | 83,273
Restructured | 9,522 | [1],[3] | 9,522 | [2] |
Total | 9,522 | [1] | 9,522 | [2] |
Commercial Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due | 4,000 |  | 9,522 |  |
Commercial Real Estate [Member] | 90 or More 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 | 2 |  | 2 |  |
Current Balance | 42,854 |  | 45,389 |  |
Recorded Investment in Loans, Total | 42,856 |  | 45,391 |  | 31,036
Non-Accrual | 5 | [1] | 6 | [2] |
Total | 5 | [1] | 6 | [2] |
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 | 184 |  | 274 |  |
Current Balance | 14,394 |  | 14,734 |  |
Recorded Investment in Loans, Total | 14,578 |  | 15,008 |  | 12,511
Non-Accrual | 323 | [1] | 413 | [2] |
Total | 323 | [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 | 184 |  | 196 |  |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance | 13,931 |  | 12,623 |  |
Recorded Investment in Loans, Total | $ 13,931 |  | $ 12,623 |  | $ 6,969
[1] | There were no loans past due 90 days and still accruing interest at March 31, 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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