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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 18,422,000 |  | $ 24,937,000 |
Current Balance |  | 10,735,266,000 |  | 9,727,679,000 |
Recorded Investment in Loans, Total |  | 10,753,688,000 |  | 9,752,616,000 |
Non-Accrual |  | 13,084,000 | [1] | 14,373,000 | [2]
Restructured |  | 160,000 | [1] | 163,000 | [2]
Nonperforming loans with no allowance | [1] | 1,249,000 |  |  |
Total | [1] | 14,493,000 |  |  |
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
Total | [2] |  |  | 14,536,000 |
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,145,000 |  | 10,564,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 14,277,000 |  | 14,373,000 |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 13,084,000 |  | 12,940,000 |
Current Balance |  | 4,067,855,000 |  | 3,426,013,000 |
Recorded Investment in Loans, Total |  | 4,080,939,000 |  | 3,438,953,000 |
Non-Accrual |  | 13,084,000 | [1] | 12,940,000 | [2]
Total | [1] | 13,084,000 |  |  |
Total | [2] |  |  | 12,940,000 |
Commercial And Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 144,000 |  |  |
Commercial And Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 12,940,000 |  | 12,940,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,627,000 |  | 11,725,000 |
Current Balance |  | 3,800,209,000 |  | 3,297,823,000 |
Recorded Investment in Loans, Total |  | 3,804,836,000 |  | 3,309,548,000 |
Non-Accrual | [2] |  |  | 1,249,000 |
Restructured |  | 160,000 | [1] | 163,000 | [2]
Nonperforming loans with no allowance | [1] | 1,249,000 |  |  |
Total | [1] | 1,409,000 |  |  |
Total | [2] |  |  | 1,412,000 |
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,290,000 |  | 10,476,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,337,000 |  | 1,249,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 1,841,516,000 |  | 2,098,211,000 |
Recorded Investment in Loans, Total |  | 1,841,516,000 |  | 2,098,211,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 386,957,000 |  | 428,549,000 |
Recorded Investment in Loans, Total |  | 386,957,000 |  | 428,549,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 532,319,000 |  | 398,839,000 |
Recorded Investment in Loans, Total |  | 532,319,000 |  | 398,839,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 686,000 |  | 267,000 |
Current Balance |  | 66,700,000 |  | 50,938,000 |
Recorded Investment in Loans, Total |  | 67,386,000 |  | 51,205,000 |
Non-Accrual | [2] |  |  | 184,000 |
Total | [2] |  |  | 184,000 |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 686,000 |  | 83,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 184,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 25,000 |  | 5,000 |
Current Balance |  | 39,710,000 |  | 27,306,000 |
Recorded Investment in Loans, Total |  | 39,735,000 |  | 27,311,000 |
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 25,000 |  | $ 5,000 |
[1] | There were no loans past due 90 days and still accruing interest at September 30, 2020.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2019.

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