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Bank Loans (Aging of the Recorded Investment in Past Due Loans) (Details) - USD ($) | Jun. 30, 2024 | Dec. 31, 2023
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | $ 19,554,758,000 |  | $ 19,441,467,000 |
Non-accrual |  | 70,791,000 | [1] | 42,366,000 | [2]
Nonperforming loans with no allowance |  | 14,312,000 | [1] | 3,090,000 | [2]
Total |  | 85,103,000 | [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 |  | 49,435,000 |  | 22,043,000 |
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 44,306,000 |  | 15,927,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 5,129,000 |  | 6,116,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 19,505,323,000 |  | 19,419,424,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 8,253,851,000 |  | 8,047,647,000 |
Non-accrual |  | 1,435,000 | [1] | 3,090,000 | [2]
Nonperforming loans with no allowance |  | 924,000 | [1] | 1,000,000 | [2]
Total |  | 2,359,000 | [1] | 4,090,000 | [2]
Residential Real Estate [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 18,468,000 |  | 19,257,000 |
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 16,109,000 |  | 15,312,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,359,000 |  | 3,945,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 8,235,383,000 |  | 8,028,390,000 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,689,379,000 |  | 3,566,987,000 |
Non-accrual | [1] | 33,266,000 |  |  |
Nonperforming loans with no allowance |  | 13,388,000 | [1] | 2,022,000 | [2]
Total |  | 46,654,000 | [1] | 2,022,000 | [2]
Commercial and Industrial [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 29,804,000 |  | 2,022,000 |
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 27,475,000 |  |  |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,329,000 |  | 2,022,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,659,575,000 |  | 3,564,965,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,346,785,000 |  | 3,633,126,000 |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 3,346,785,000 |  | 3,633,126,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,253,045,000 |  | 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 |  | 2,253,045,000 |  | 2,306,452,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 608,911,000 |  | 660,631,000 |
Non-accrual |  | 35,649,000 | [1] | 39,195,000 | [2]
Total |  | 35,649,000 | [1] | 39,195,000 | [2]
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 608,911,000 |  | 660,631,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,198,395,000 |  | 1,034,370,000 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,198,395,000 |  | 1,034,370,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 158,472,000 |  | 136,270,000 |
Non-accrual |  | 378,000 | [1] | 22,000 | [2]
Nonperforming loans with no allowance | [2] |  |  | 65,000 |
Total |  | 378,000 | [1] | 87,000 | [2]
Home Equity Lines Of Credit [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 1,059,000 |  | 657,000 |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 681,000 |  | 570,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 378,000 |  | 87,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 157,413,000 |  | 135,613,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 45,920,000 |  | 55,981,000 |
Non-accrual |  | 63,000 | [1] | 59,000 | [2]
Total |  | 63,000 | [1] | 59,000 | [2]
Other [Member] | Financial Asset, Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 104,000 |  | 104,000 |
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 41,000 |  | 45,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 63,000 |  | 59,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | $ 45,816,000 |  | $ 55,877,000 |
[1] | There were no loans past due 90 days and still accruing interest at June 30, 2024.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2023. In the normal course of business, we may modify the original terms of a loan agreement. In certain circumstances, we may agree to modify the original terms of a loan agreement to a borrower experiencing financial difficulty, which may include a borrower in default, financial distress, bankruptcy or other circumstances. Modifications of loans to borrowers experiencing financial difficulty are designed to reduce our loss exposure while providing borrowers with an opportunity to work through financial difficulties, often to avoid foreclosure or bankruptcy. Loan modifications to borrowers experiencing financial difficulty typically involve principal forgiveness, an interest rate reduction, an other-than-insignificant payment delay (i.e., payment or maturity forbearance greater than six months), or a term extension, or any combination thereof. Modified loans to borrowers experiencing financial difficulty are subject to our nonaccrual policies. Loans to borrowers experiencing financial difficulty which were modified during the three and six months ended June 30, 2024 and 2023 were not significant. The gross interest income related to impaired loans, which would have been recorded, had these loans been current in accordance with their original terms, and the interest income recognized on these loans during the three and six months ended June 30, 2024 and 2023, were insignificant to the consolidated financial statements.

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