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Bank Loans (Aging of the Recorded Investment in Past Due Loans) (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | $ 20,879,745,000 |  | $ 19,441,467,000 |
Non-accrual |  | 77,966,000 | [1] | 42,366,000 | [2]
Nonperforming loans with no allowance |  | 82,934,000 | [1] | 3,090,000 | [2]
Total |  | 160,900,000 | [1] | 45,456,000 | [2]
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 103,956,000 |  | 22,043,000 |
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 72,100,000 |  | 15,927,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 31,856,000 |  | 6,116,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 20,775,789,000 |  | 19,419,424,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 8,565,193,000 |  | 8,047,647,000 |
Non-accrual |  | 1,433,000 | [1] | 3,090,000 | [2]
Nonperforming loans with no allowance |  | 2,463,000 | [1] | 1,000,000 | [2]
Total |  | 3,896,000 | [1] | 4,090,000 | [2]
Residential Real Estate [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 16,330,000 |  | 19,257,000 |
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 12,057,000 |  | 15,312,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 4,273,000 |  | 3,945,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 8,548,863,000 |  | 8,028,390,000 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 4,062,029,000 |  | 3,566,987,000 |
Non-accrual | [1] | 76,254,000 |  |  |
Nonperforming loans with no allowance |  | 13,504,000 | [1] | 2,022,000 | [2]
Total |  | 89,758,000 | [1] | 2,022,000 | [2]
Commercial and Industrial [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 86,586,000 |  | 2,022,000 |
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 59,396,000 |  |  |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 27,190,000 |  | 2,022,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,975,443,000 |  | 3,564,965,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,854,222,000 |  | 3,633,126,000 |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,854,222,000 |  | 3,633,126,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,389,593,000 |  | 2,306,455,000 |
Nonperforming loans with no allowance | [2] |  |  | 3,000 |
Total | [2] |  |  | 3,000 |
Securities-Based Loans [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  |  |  | 3,000 |
Securities-Based Loans [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  |  |  | 3,000 |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,389,593,000 |  | 2,306,452,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,242,002,000 |  | 1,034,370,000 |
Nonperforming loans with no allowance | [1] | 41,412,000 |  |  |
Total | [1] | 41,412,000 |  |  |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,242,002,000 |  | 1,034,370,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 518,923,000 |  | 660,631,000 |
Non-accrual | [2] |  |  | 39,195,000 |
Nonperforming loans with no allowance | [1] | 25,441,000 |  |  |
Total |  | 25,441,000 | [1] | 39,195,000 | [2]
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 518,923,000 |  | 660,631,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 193,850,000 |  | 136,270,000 |
Non-accrual |  | 201,000 | [1] | 22,000 | [2]
Nonperforming loans with no allowance |  | 114,000 | [1] | 65,000 | [2]
Total |  | 315,000 | [1] | 87,000 | [2]
Home Equity Lines Of Credit [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 955,000 |  | 657,000 |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 640,000 |  | 570,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 315,000 |  | 87,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 192,895,000 |  | 135,613,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 53,933,000 |  | 55,981,000 |
Non-accrual |  | 78,000 | [1] | 59,000 | [2]
Total |  | 78,000 | [1] | 59,000 | [2]
Other [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 85,000 |  | 104,000 |
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 7,000 |  | 45,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 78,000 |  | 59,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | $ 53,848,000 |  | $ 55,877,000 |
[1] | There were no loans past due 90 days and still accruing interest at December 31, 2024.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2023.

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