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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 25,233,000 |  | $ 22,043,000 |
Total |  | 19,091,860,000 |  | 19,441,467,000 |
Non-accrual |  | 42,660,000 | [1] | 42,221,000 | [2]
Restructured |  | 144,000 | [1] | 145,000 | [2]
Nonperforming loans with no allowance |  | 16,625,000 | [1] | 3,090,000 | [2]
Total |  | 59,429,000 | [1] | 45,456,000 | [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 |  | 20,635,000 |  | 15,927,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,598,000 |  | 6,116,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 19,066,627,000 |  | 19,419,424,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 24,829,000 |  | 19,257,000 |
Total |  | 8,096,975,000 |  | 8,047,647,000 |
Non-accrual |  | 2,009,000 | [1] | 2,945,000 | [2]
Restructured |  | 144,000 | [1] | 145,000 | [2]
Nonperforming loans with no allowance |  | 2,438,000 | [1] | 1,000,000 | [2]
Total |  | 4,591,000 | [1] | 4,090,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 20,382,000 |  | 15,312,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,447,000 |  | 3,945,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,072,146,000 |  | 8,028,390,000 |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 2,022,000 |
Total |  | 3,541,770,000 |  | 3,566,987,000 |
Non-accrual | [1] | 2,329,000 |  |  |
Nonperforming loans with no allowance |  | 14,187,000 | [1] | 2,022,000 | [2]
Total |  | 16,516,000 | [1] | 2,022,000 | [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 |
Commercial And Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,541,770,000 |  | 3,564,965,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,129,642,000 |  | 3,633,126,000 |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,129,642,000 |  | 3,633,126,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 3,000 |
Total |  | 2,302,250,000 |  | 2,306,455,000 |
Nonperforming loans with no allowance | [2] |  |  | 3,000 |
Total | [2] |  |  | 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 |  | 2,302,250,000 |  | 2,306,452,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,167,300,000 |  | 1,034,370,000 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,167,300,000 |  | 1,034,370,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Total |  | 655,355,000 |  | 660,631,000 |
Non-accrual |  | 38,171,000 | [1] | 39,195,000 | [2]
Total |  | 38,171,000 | [1] | 39,195,000 | [2]
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 |  | 655,355,000 |  | 660,631,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 344,000 |  | 657,000 |
Total |  | 150,452,000 |  | 136,270,000 |
Non-accrual |  | 102,000 | [1] | 22,000 | [2]
Nonperforming loans with no allowance | [2] |  |  | 65,000 |
Total |  | 102,000 | [1] | 87,000 | [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 242,000 |  | 570,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 102,000 |  | 87,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 150,108,000 |  | 135,613,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 60,000 |  | 104,000 |
Total |  | 48,116,000 |  | 55,981,000 |
Non-accrual |  | 49,000 | [1] | 59,000 | [2]
Total |  | 49,000 | [1] | 59,000 | [2]
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 11,000 |  | 45,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 49,000 |  | 59,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 48,056,000 |  | $ 55,877,000 |
[1] | There were no loans past due 90 days and still accruing interest at March 31, 2024
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2023.

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