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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 12,065,000 |  | $ 18,241,000 |
Total |  | 13,631,287,000 |  | 11,170,813,000 |
Non-Accrual |  | 6,922,000 | [1] | 12,395,000 | [2]
Restructured |  | 156,000 | [1] | 158,000 | [2]
Nonperforming loans with no allowance |  | 1,249,000 | [1] | 1,249,000 | [2]
Total |  | 8,327,000 | [1] | 13,802,000 | [2]
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
Non-Accrual |  | 6,922,000 | [1] | 12,395,000 | [2]
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,894,000 |  | 4,611,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,171,000 |  | 13,630,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 13,619,222,000 |  | 11,152,572,000 |
Residential Mortgage |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,227,000 |  | 5,803,000 |
Total |  | 4,952,372,000 |  | 3,956,670,000 |
Non-Accrual | [1] | 84,000 |  |  |
Restructured |  | 156,000 | [1] | 158,000 | [2]
Nonperforming loans with no allowance |  | 1,249,000 | [1] | 1,249,000 | [2]
Total |  | 1,489,000 | [1] | 1,407,000 | [2]
Non-Accrual | [1] | 84,000 |  |  |
Residential Mortgage | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,894,000 |  | 4,554,000 |
Residential Mortgage | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,333,000 |  | 1,249,000 |
Residential Mortgage | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,947,145,000 |  | 3,950,867,000 |
Commercial And Industrial |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,805,000 |  | 12,251,000 |
Total |  | 5,033,313,000 |  | 4,296,089,000 |
Non-Accrual |  | 6,805,000 | [1] | 12,251,000 | [2]
Total |  | 6,805,000 | [1] | 12,251,000 | [2]
Non-Accrual |  | 6,805,000 | [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 |  | 6,805,000 |  | 12,237,000 |
Commercial And Industrial | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,026,508,000 |  | 4,283,838,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,581,705,000 |  | 1,933,974,000 |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,581,705,000 |  | 1,933,974,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 33,000 |  | 144,000 |
Total |  | 369,502,000 |  | 366,485,000 |
Non-Accrual |  | 33,000 | [1] | 144,000 | [2]
Total |  | 33,000 | [1] | 144,000 | [2]
Non-Accrual |  | 33,000 | [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 |  | 33,000 |  | 144,000 |
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 369,469,000 |  | 366,341,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 12,000 |
Total |  | 82,230,000 |  | 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 |  |  |  | 12,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 82,230,000 |  | 75,495,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 576,362,000 |  | 501,681,000 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 576,362,000 |  | 501,681,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 31,000 |
Total |  | 35,803,000 |  | 40,407,000 |
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 31,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 35,803,000 |  | $ 40,376,000 |
[1] | There were no loans past due 90 days and still accruing interest at September 30, 2021.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2020.

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