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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 22,170,000 |  | $ 19,961,000 |
Current Balance |  | 8,559,477,000 |  | 6,994,460,000 |
Recorded Investment in Loans, Total |  | 8,581,647,000 |  | 7,014,421,000 |
Non-accrual |  | 15,298,000 | [1] | 20,090,000 | [2]
Restructured |  | 9,103,000 | [1] | 9,123,000 | [2]
Total |  | 24,401,000 | [1] | 29,213,000 | [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 |  | 7,003,000 |  | 19,961,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 15,167,000 |  |  |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,347,000 |  | 7,892,000 |
Current Balance |  | 2,867,667,000 |  | 2,585,684,000 |
Recorded Investment in Loans, Total |  | 2,875,014,000 |  | 2,593,576,000 |
Non-accrual | [1] | 352,000 |  |  |
Restructured |  | 167,000 | [1] | 171,000 | [2]
Total |  | 519,000 | [1] | 171,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,970,000 |  | 7,892,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 377,000 |  |  |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 14,656,000 |  | 11,883,000 |
Current Balance |  | 3,289,578,000 |  | 2,426,055,000 |
Recorded Investment in Loans, Total |  | 3,304,234,000 |  | 2,437,938,000 |
Non-accrual |  | 14,741,000 | [1] | 19,904,000 | [2]
Restructured |  | 8,936,000 | [1] | 8,952,000 | [2]
Total |  | 23,677,000 | [1] | 28,856,000 | [2]
Commercial And Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 11,883,000 |
Commercial And Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 14,656,000 |  |  |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 1,786,966,000 |  | 1,819,206,000 |
Recorded Investment in Loans, Total |  | 1,786,966,000 |  | 1,819,206,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 318,961,000 |  | 116,258,000 |
Recorded Investment in Loans, Total |  | 318,961,000 |  | 116,258,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 33,000 |  | 184,000 |
Current Balance |  | 38,065,000 |  | 14,855,000 |
Recorded Investment in Loans, Total |  | 38,098,000 |  | 15,039,000 |
Non-accrual |  | 184,000 | [1] | 184,000 | [2]
Total |  | 184,000 | [1] | 184,000 | [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 33,000 |  | 184,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 138,245,000 |  | 7,896,000 |
Recorded Investment in Loans, Total |  | 138,245,000 |  | 7,896,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 134,000 |  | 2,000 |
Current Balance |  | 119,995,000 |  | 24,506,000 |
Recorded Investment in Loans, Total |  | 120,129,000 |  | 24,508,000 |
Non-accrual |  | 21,000 | [1] | 2,000 | [2]
Total |  | 21,000 | [1] | 2,000 | [2]
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | $ 2,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 134,000 |  |  |
[1] | There were no loans past due 90 days and still accruing interest at December 31, 2018.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2017.

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