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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 19,331,000 |  | $ 23,432,000 |
Total |  | 19,158,620,000 |  | 16,743,487,000 |
Non-Accrual |  | 29,156,000 | [1] | 17,193,000 | [2]
Restructured |  | 153,000 | [1] | 154,000 | [2]
Nonperforming loans with no allowance |  | 0 | [1] | 1,000 | [2]
Total |  | 29,309,000 | [1] | 17,348,000 | [2]
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
Non-Accrual |  | 29,156,000 | [1] | 17,193,000 | [2]
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,159,000 |  | 15,528,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 17,172,000 |  | 7,904,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 19,139,289,000 |  | 16,720,055,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,237,000 |  | 7,526,000 |
Total |  | 6,607,825,000 |  | 5,482,026,000 |
Non-Accrual |  | 1,790,000 | [1] | 1,332,000 | [2]
Restructured |  | 153,000 | [1] | 154,000 | [2]
Nonperforming loans with no allowance | [2] |  |  | 0 |
Total |  | 1,943,000 | [1] | 1,486,000 | [2]
Non-Accrual |  | 1,790,000 | [1] | 1,332,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,447,000 |  | 6,194,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,790,000 |  | 1,332,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,604,588,000 |  | 5,474,500,000 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 15,368,000 |  | 15,861,000 |
Total |  | 8,347,410,000 |  | 7,345,753,000 |
Non-Accrual |  | 27,352,000 | [1] | 15,861,000 | [2]
Total |  | 27,352,000 | [1] | 15,861,000 | [2]
Non-Accrual |  | 27,352,000 | [1] | 15,861,000 | [2]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 9,290,000 |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 15,368,000 |  | 6,571,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,332,042,000 |  | 7,329,892,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,993,552,000 |  | 2,880,158,000 |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,993,552,000 |  | 2,880,158,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1,000 |
Total |  | 629,459,000 |  | 409,847,000 |
Non-Accrual | [2] |  |  | 0 |
Nonperforming loans with no allowance | [2] |  |  | 1,000 |
Total | [2] |  |  | 1,000 |
Non-Accrual | [2] |  |  | 0 |
Commercial Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1,000 |
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 629,459,000 |  | 409,846,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 699,000 |  | 0 |
Total |  | 103,096,000 |  | 82,508,000 |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 699,000 |  | 0 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 102,397,000 |  | 82,508,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 432,039,000 |  | 511,084,000 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 432,039,000 |  | 511,084,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 27,000 |  | 44,000 |
Total |  | 45,239,000 |  | 32,111,000 |
Non-Accrual | [1] | 14,000 |  |  |
Total | [1] | 14,000 |  |  |
Non-Accrual | [1] | 14,000 |  |  |
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 13,000 |  | 44,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 14,000 |  |  |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 45,212,000 |  | $ 32,067,000 |
[1] | There were no loans past due 90 days and still accruing interest at June 30, 2022
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2021.

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