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Bank Loans (Aging of Recorded Investment in Past Due Loans) (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 16,002,000 |  | $ 12,612,000 |
Total |  | 20,452,389,000 |  | 20,602,558,000 |
Non-Accrual |  | 49,647,000 | [1] | 10,102,000 | [2]
Restructured |  | 146,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 926,000 | [1] | 0 | [2]
Total |  | 50,719,000 | [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 |  | 5,176,000 |  | 2,510,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 10,826,000 |  | 10,102,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 20,436,387,000 |  | 20,589,946,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,612,000 |  | 3,133,000 |
Total |  | 7,957,027,000 |  | 7,371,671,000 |
Non-Accrual |  | 616,000 | [1] | 870,000 | [2]
Restructured |  | 146,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 924,000 | [1] | 0 | [2]
Total |  | 1,686,000 | [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 |  | 5,072,000 |  | 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 |  | 1,540,000 |  | 688,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,950,415,000 |  | 7,368,538,000 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 9,233,000 |  | 9,226,000 |
Total |  | 4,367,671,000 |  | 4,897,176,000 |
Non-Accrual |  | 9,233,000 | [1] | 9,226,000 | [2]
Restructured | [1] | 0 |  |  |
Nonperforming loans with no allowance | [1] | 0 |  |  |
Total |  | 9,233,000 | [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 |  | 0 |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 9,233,000 |  | 9,226,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,358,438,000 |  | 4,887,950,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Total |  | 4,114,889,000 |  | 4,182,641,000 |
Fund Banking [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Fund Banking [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,114,889,000 |  | 4,182,641,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Total |  | 2,317,631,000 |  | 2,724,551,000 |
Securities-Based Loans [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Securities-Based Loans [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,317,631,000 |  | 2,724,551,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Total |  | 670,907,000 |  | 675,599,000 |
Non-Accrual | [1] | 39,747,000 |  |  |
Restructured | [1] | 0 |  |  |
Nonperforming loans with no allowance | [1] | 0 |  |  |
Total | [1] | 39,747,000 |  |  |
Commercial Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Commercial Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 670,907,000 |  | 675,599,000 |
Construction and Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Total |  | 851,709,000 |  | 593,191,000 |
Construction and Land [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Construction and Land [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Construction and Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 851,709,000 |  | 593,191,000 |
Home Equity Lines of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 73,000 |  | 211,000 |
Total |  | 123,995,000 |  | 107,136,000 |
Non-Accrual | [1] | 22,000 |  |  |
Restructured | [1] | 0 |  |  |
Nonperforming loans with no allowance | [1] | 0 |  |  |
Total | [1] | 22,000 |  |  |
Home Equity Lines of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 51,000 |  | 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 |  | 22,000 |  | 182,000 |
Home Equity Lines of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 123,922,000 |  | 106,925,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 84,000 |  | 42,000 |
Total |  | 48,560,000 |  | 50,593,000 |
Non-Accrual |  | 29,000 | [1] | 6,000 | [2]
Restructured | [1] | 0 |  |  |
Nonperforming loans with no allowance |  | 2,000 | [1] | 0 | [2]
Total |  | 31,000 | [1] | 6,000 | [2]
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 53,000 |  | 36,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 31,000 |  | 6,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 48,476,000 |  | $ 50,551,000 |
[1] | There were no loans past due 90 days and still accruing interest at September 30, 2023.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2022.

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