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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | $ 23,432,000 | $ 18,241,000 |
Total |  | 16,743,487,000 | 11,170,813,000 |
Non-accrual |  | 17,193,000 | 12,395,000 | [1]
Restructured |  | 154,000 | 158,000 | [1]
Nonperforming loans with no allowance |  | 1,000 | 1,249,000 | [1]
Total |  | 17,348,000 | 13,802,000 | [1]
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 |  | 15,528,000 | 4,611,000 |
90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 7,904,000 | 13,630,000 |
Current Balance [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 16,720,055,000 | 11,152,572,000 |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 15,861,000 | 12,251,000 |
Total |  | 7,345,753,000 | 4,296,089,000 |
Non-accrual |  | 15,861,000 | 12,251,000 | [1]
Total |  | 15,861,000 | 12,251,000 | [1]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 9,290,000 | 14,000 |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 6,571,000 | 12,237,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 7,329,892,000 | 4,283,838,000 |
Residential Real Estate [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 7,526,000 | 5,803,000 |
Total |  | 5,482,026,000 | 3,956,670,000 |
Non-accrual |  | 1,332,000 |  |
Restructured |  | 154,000 | 158,000 | [1]
Nonperforming loans with no allowance | [1] |  | 1,249,000 |
Total |  | 1,486,000 | 1,407,000 | [1]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 6,194,000 | 4,554,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 1,332,000 | 1,249,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 5,474,500,000 | 3,950,867,000 |
Securities-Based Loans [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total |  | 2,880,158,000 | 1,933,974,000 |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 2,880,158,000 | 1,933,974,000 |
Construction And Land [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total |  | 511,084,000 | 501,681,000 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 511,084,000 | 501,681,000 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 1,000 | 144,000 |
Total |  | 409,847,000 | 366,485,000 |
Non-accrual | [1] |  | 144,000 |
Nonperforming loans with no allowance |  | 1,000 |  |
Total |  | 1,000 | 144,000 | [1]
Commercial Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 1,000 | 144,000 |
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 409,846,000 | 366,341,000 |
Home Equity Lines Of Credit [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 12,000 |
Total |  | 82,508,000 | 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 |  | 82,508,000 | 75,495,000 |
Other [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 44,000 | 31,000 |
Total |  | 32,111,000 | 40,407,000 |
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | 44,000 | 31,000 |
Other [Member] | Current Balance [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  | $ 32,067,000 | $ 40,376,000 |
[1] | There were no loans past due 90 days and still accruing interest at December 31, 2020.

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