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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 22,043,000 |  | $ 12,612,000 |
Total |  | 19,441,467,000 |  | 20,602,558,000 |
Non-accrual |  | 42,221,000 | [1] | 10,102,000 | [2]
Restructured |  | 145,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 3,090,000 | [1] | 0 | [2]
Total |  | 45,456,000 | [1] | 10,252,000 | [2]
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 |  | 15,927,000 |  | 2,510,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,116,000 |  | 10,102,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 19,419,424,000 |  | 20,589,946,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 19,257,000 |  | 3,133,000 |
Total |  | 8,047,647,000 |  | 7,371,671,000 |
Non-accrual |  | 2,945,000 | [1] | 870,000 | [2]
Restructured |  | 145,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 1,000,000 | [1] | 0 | [2]
Total |  | 4,090,000 | [1] | 1,020,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 15,312,000 |  | 2,445,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,945,000 |  | 688,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,028,390,000 |  | 7,368,538,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,633,126,000 |  | 4,182,641,000 |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,633,126,000 |  | 4,182,641,000 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,022,000 |  | 9,226,000 |
Total |  | 3,566,987,000 |  | 4,897,176,000 |
Non-accrual | [2] |  |  | 9,226,000 |
Nonperforming loans with no allowance | [1] | 2,022,000 |  |  |
Total |  | 2,022,000 | [1] | 9,226,000 | [2]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,022,000 |  | 9,226,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,564,965,000 |  | 4,887,950,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,000 |  |  |
Total |  | 2,306,455,000 |  | 2,724,551,000 |
Nonperforming loans with no allowance | [1] | 3,000 |  |  |
Total | [1] | 3,000 |  |  |
Securities-Based Loans [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,000 |  |  |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,306,452,000 |  | 2,724,551,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,034,370,000 |  | 593,191,000 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,034,370,000 |  | 593,191,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Total |  | 660,631,000 |  | 675,599,000 |
Non-accrual | [1] | 39,195,000 |  |  |
Total | [1] | 39,195,000 |  |  |
Commercial Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 660,631,000 |  | 675,599,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 657,000 |  | 211,000 |
Total |  | 136,270,000 |  | 107,136,000 |
Non-accrual | [1] | 22,000 |  |  |
Nonperforming loans with no allowance | [1] | 65,000 |  |  |
Total | [1] | 87,000 |  |  |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 570,000 |  | 29,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 87,000 |  | 182,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 135,613,000 |  | 106,925,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 104,000 |  | 42,000 |
Total |  | 55,981,000 |  | 50,593,000 |
Non-accrual |  | 59,000 | [1] | 6,000 | [2]
Nonperforming loans with no allowance | [2] |  |  | 0 |
Total |  | 59,000 | [1] | 6,000 | [2]
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 45,000 |  | 36,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 59,000 |  | 6,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 55,877,000 |  | $ 50,551,000 |
[1] | There were no loans past due 90 days and still accruing interest at December 31, 2023.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2022.

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