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Bank Loans (Risk Category of Loan Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | $ 20,372,268 | $ 20,879,745
Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 19,919,144 | 20,349,043
Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 107,625 | 173,237
Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 191,411 | 213,523
Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 154,088 | 143,942
Residential Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 8,699,229 | 8,565,193
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 8,685,802 | 8,557,320
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 7,178 | 3,600
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 6,249 | 4,273
Fund Banking [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,659,294 | 3,854,222
Fund Banking [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,659,294 | 3,854,222
Commercial and Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,678,411 | 4,062,029
Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,361,378 | 3,662,866
Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 100,447 | 169,637
Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 103,471 | 152,515
Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 113,115 | 77,011
Securities-Based Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,404,960 | 2,389,593
Securities-Based Loans [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,404,960 | 2,389,593
Construction And Land [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 1,206,876 | 1,242,002
Construction And Land [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 1,165,983 | 1,200,590
Construction And Land [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 40,893 | 41,412
Commercial Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 472,550 | 518,923
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 391,412 | 437,062
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 81,138 | 56,420
Commercial Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio |  | 25,441
Home Equity Lines Of Credit [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 195,811 | 193,850
Home Equity Lines Of Credit [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 195,258 | 193,535
Home Equity Lines Of Credit [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 553 | 315
Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 55,137 | 53,933
Other [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 55,057 | 53,855
Other [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | $ 80 | $ 78

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