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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | $ 17,827,000 |  | $ 22,170,000 |
Current Balance | 9,048,451,000 |  | 8,559,477,000 |
Recorded Investment in Loans, Total | 9,066,278,000 |  | 8,581,647,000 |
Non-Accrual | 15,515,000 | [1] | 15,298,000 | [2]
Restructured | 7,881,000 | [1] | 9,103,000 | [2]
Total | 23,396,000 | [1] | 24,401,000 | [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 | 2,569,000 |  | 7,003,000 |
90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 15,258,000 |  | 15,167,000 |
Commercial And Industrial [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 14,211,000 |  | 14,656,000 |
Current Balance | 3,323,916,000 |  | 3,289,578,000 |
Recorded Investment in Loans, Total | 3,338,127,000 |  | 3,304,234,000 |
Non-Accrual | 14,211,000 | [1] | 14,741,000 | [2]
Restructured | 7,715,000 | [1] | 8,936,000 | [2]
Total | 21,926,000 | [1] | 23,677,000 | [2]
Commercial And Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 14,211,000 |  | 14,656,000 |
Residential Real Estate [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 3,277,000 |  | 7,347,000 |
Current Balance | 2,981,448,000 |  | 2,867,667,000 |
Recorded Investment in Loans, Total | 2,984,725,000 |  | 2,875,014,000 |
Non-Accrual | 955,000 | [1] | 352,000 | [2]
Restructured | 166,000 | [1] | 167,000 | [2]
Total | 1,121,000 | [1] | 519,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 2,385,000 |  | 6,970,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 892,000 |  | 377,000 |
Securities-Based Loans [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Current Balance | 1,962,528,000 |  | 1,786,966,000 |
Recorded Investment in Loans, Total | 1,962,528,000 |  | 1,786,966,000 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Current Balance | 367,283,000 |  | 318,961,000 |
Recorded Investment in Loans, Total | 367,283,000 |  | 318,961,000 |
Construction And Land [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Current Balance | 226,559,000 |  | 138,245,000 |
Recorded Investment in Loans, Total | 226,559,000 |  | 138,245,000 |
Home Equity Lines Of Credit [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 184,000 |  | 33,000 |
Current Balance | 49,025,000 |  | 38,065,000 |
Recorded Investment in Loans, Total | 49,209,000 |  | 38,098,000 |
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 | 184,000 |  | 33,000 |
Other [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 155,000 |  | 134,000 |
Current Balance | 137,692,000 |  | 119,995,000 |
Recorded Investment in Loans, Total | 137,847,000 |  | 120,129,000 |
Non-Accrual | 165,000 | [1] | 21,000 | [2]
Total | 165,000 | [1] | 21,000 | [2]
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | $ 155,000 |  | $ 134,000 |
[1] | There were no loans past due 90 days and still accruing interest at June 30, 2019.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2018.

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