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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 15,670,000 |  | $ 18,241,000 |
Current Balance |  | 12,883,137,000 |  | 11,152,572,000 |
Total |  | 12,898,807,000 |  | 11,170,813,000 |
Non-Accrual |  | 8,280,000 | [1] | 12,395,000 | [2]
Restructured |  | 157,000 | [1] | 158,000 | [2]
Nonperforming loans with no allowance |  | 1,249,000 | [1] | 1,249,000 | [2]
Total |  | 9,686,000 | [1] | 13,802,000 | [2]
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
Non-Accrual |  | 8,280,000 | [1] | 12,395,000 | [2]
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,141,000 |  | 4,611,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 9,529,000 |  | 13,630,000 |
Residential Mortgage |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,509,000 |  | 5,803,000 |
Current Balance |  | 4,558,958,000 |  | 3,950,867,000 |
Total |  | 4,567,467,000 |  | 3,956,670,000 |
Non-Accrual | [1] | 1,148,000 |  |  |
Restructured |  | 157,000 | [1] | 158,000 | [2]
Nonperforming loans with no allowance |  | 1,249,000 | [1] | 1,249,000 | [2]
Total |  | 2,554,000 | [1] | 1,407,000 | [2]
Non-Accrual | [1] | 1,148,000 |  |  |
Residential Mortgage | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,112,000 |  | 4,554,000 |
Residential Mortgage | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,397,000 |  | 1,249,000 |
Commercial And Industrial |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,096,000 |  | 12,251,000 |
Current Balance |  | 4,943,420,000 |  | 4,283,838,000 |
Total |  | 4,950,516,000 |  | 4,296,089,000 |
Non-Accrual |  | 7,096,000 | [1] | 12,251,000 | [2]
Total |  | 7,096,000 | [1] | 12,251,000 | [2]
Non-Accrual |  | 7,096,000 | [1] | 12,251,000 | [2]
Commercial And Industrial | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 14,000 |
Commercial And Industrial | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,096,000 |  | 12,237,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 2,331,737,000 |  | 1,933,974,000 |
Total |  | 2,331,737,000 |  | 1,933,974,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 36,000 |  | 144,000 |
Current Balance |  | 370,481,000 |  | 366,341,000 |
Total |  | 370,517,000 |  | 366,485,000 |
Non-Accrual |  | 36,000 | [1] | 144,000 | [2]
Total |  | 36,000 | [1] | 144,000 | [2]
Non-Accrual |  | 36,000 | [1] | 144,000 | [2]
Commercial Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 36,000 |  | 144,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 16,000 |  | 12,000 |
Current Balance |  | 76,823,000 |  | 75,495,000 |
Total |  | 76,839,000 |  | 75,507,000 |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 16,000 |  | 12,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current Balance |  | 563,552,000 |  | 501,681,000 |
Total |  | 563,552,000 |  | 501,681,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 13,000 |  | 31,000 |
Current Balance |  | 38,166,000 |  | 40,376,000 |
Total |  | 38,179,000 |  | 40,407,000 |
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 13,000 |  | $ 31,000 |
[1] | There were no loans past due 90 days and still accruing interest at June 30, 2021.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2020.

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