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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022
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Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 15,597,000 |  | $ 12,612,000 |
Total |  | 20,899,444,000 |  | 20,602,558,000 |
Non-Accrual |  | 10,600,000 | [1] | 10,102,000 | [2]
Restructured |  | 149,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 0 | [1] | 0 | [2]
Total |  | 10,749,000 | [1] | 10,252,000 | [2]
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
Non-Accrual |  | 10,600,000 | [1] | 10,102,000 | [2]
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,997,000 |  | 2,510,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 10,600,000 |  | 10,102,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 20,883,847,000 |  | 20,589,946,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,658,000 |  | 3,133,000 |
Total |  | 7,494,788,000 |  | 7,371,671,000 |
Non-Accrual |  | 720,000 | [1] | 870,000 | [2]
Restructured |  | 149,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 0 | [1] | 0 | [2]
Total |  | 869,000 | [1] | 1,020,000 | [2]
Non-Accrual |  | 720,000 | [1] | 870,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,938,000 |  | 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 |  | 720,000 |  | 688,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,489,130,000 |  | 7,368,538,000 |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 9,550,000 |  | 9,226,000 |
Total |  | 4,755,664,000 |  | 4,897,176,000 |
Non-Accrual |  | 9,550,000 | [1] | 9,226,000 | [2]
Total |  | 9,550,000 | [1] | 9,226,000 | [2]
Non-Accrual |  | 9,550,000 | [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 |  | 9,550,000 |  | 9,226,000 |
Commercial And Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,746,114,000 |  | 4,887,950,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 4,623,423,000 |  | 4,182,641,000 |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,623,423,000 |  | 4,182,641,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,558,343,000 |  | 2,724,551,000 |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,558,343,000 |  | 2,724,551,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Total |  | 663,325,000 |  | 675,599,000 |
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 |  | 663,325,000 |  | 675,599,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Total |  | 644,800,000 |  | 593,191,000 |
Construction And Land [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 644,800,000 |  | 593,191,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 332,000 |  | 211,000 |
Total |  | 109,197,000 |  | 107,136,000 |
Non-Accrual | [1] | 310,000 |  |  |
Total | [1] | 310,000 |  |  |
Non-Accrual | [1] | 310,000 |  |  |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 22,000 |  | 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 |  | 310,000 |  | 182,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 108,865,000 |  | 106,925,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 57,000 |  | 42,000 |
Total |  | 49,904,000 |  | 50,593,000 |
Non-Accrual |  | 20,000 | [1] | 6,000 | [2]
Nonperforming loans with no allowance |  | 0 | [1] | 0 | [2]
Total |  | 20,000 | [1] | 6,000 | [2]
Non-Accrual |  | 20,000 | [1] | 6,000 | [2]
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 37,000 |  | 36,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 20,000 |  | 6,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 49,847,000 |  | $ 50,551,000 |
[1] | There were no loans past due 90 days and still accruing interest at March 31, 2023
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2022.

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