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Bank Loans (Aging of the Recorded Investment in Past Due Loans) (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | $ 21,177,141,000 |  | $ 20,879,745,000 |
Non-accrual |  | 109,019,000 | [1] | 77,966,000 | [2]
Nonperforming loans with no allowance |  | 50,055,000 | [1] | 82,934,000 | [2]
Total |  | 159,074,000 | [1] | 160,900,000 | [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 |  | 21,428,000 |  | 72,100,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 92,429,000 |  | 31,856,000 |
Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 113,857,000 |  | 103,956,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 21,063,284,000 |  | 20,775,789,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 9,085,945,000 |  | 8,565,193,000 |
Non-accrual |  | 5,049,000 | [1] | 1,433,000 | [2]
Nonperforming loans with no allowance |  | 7,452,000 | [1] | 2,463,000 | [2]
Total |  | 12,501,000 | [1] | 3,896,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 4,540,000 |  | 12,057,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 12,501,000 |  | 4,273,000 |
Residential Real Estate [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 17,041,000 |  | 16,330,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 9,068,904,000 |  | 8,548,863,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,881,895,000 |  | 3,854,222,000 |
Fund Banking [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 0 |  |  |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,881,895,000 |  | 3,854,222,000 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,760,005,000 |  | 4,062,029,000 |
Non-accrual |  | 103,505,000 | [1] | 76,254,000 | [2]
Nonperforming loans with no allowance |  | 2,336,000 | [1] | 13,504,000 | [2]
Total |  | 105,841,000 | [1] | 89,758,000 | [2]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 16,185,000 |  | 59,396,000 |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 78,341,000 |  | 27,190,000 |
Commercial and Industrial [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 94,526,000 |  | 86,586,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,665,479,000 |  | 3,975,443,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,565,897,000 |  | 2,389,593,000 |
Securities-Based Loans [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 90,000 |  |  |
Securities-Based Loans [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 90,000 |  |  |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,565,807,000 |  | 2,389,593,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 437,570,000 |  | 518,923,000 |
Nonperforming loans with no allowance | [2] |  |  | 25,441,000 |
Total | [2] |  |  | 25,441,000 |
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 437,570,000 |  | 518,923,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,166,895,000 |  | 1,242,002,000 |
Nonperforming loans with no allowance |  | 39,145,000 | [1] | 41,412,000 | [2]
Total |  | 39,145,000 | [1] | 41,412,000 | [2]
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,166,895,000 |  | 1,242,002,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 218,320,000 |  | 193,850,000 |
Non-accrual |  | 409,000 | [1] | 201,000 | [2]
Nonperforming loans with no allowance |  | 1,095,000 | [1] | 114,000 | [2]
Total |  | 1,504,000 | [1] | 315,000 | [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 574,000 |  | 640,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,504,000 |  | 315,000 |
Home Equity Lines Of Credit [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,078,000 |  | 955,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 216,242,000 |  | 192,895,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 60,614,000 |  | 53,933,000 |
Non-accrual |  | 56,000 | [1] | 78,000 | [2]
Nonperforming loans with no allowance | [1] | 27,000 |  |  |
Total |  | 83,000 | [1] | 78,000 | [2]
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 39,000 |  | 7,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 83,000 |  | 78,000 |
Other [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 122,000 |  | 85,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | $ 60,492,000 |  | $ 53,848,000 |
[1] | There were no loans past due 90 days and still accruing interest at September 30, 2025.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2024.

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