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Bank Loans (Risk Category of Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | $ 20,349,581 | $ 19,441,467
Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 19,821,820 | 18,943,697
Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 154,501 | 211,686
Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 245,586 | 284,000
Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 127,674 | 2,084
Residential Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 8,406,932 | 8,047,647
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 8,401,700 | 8,042,246
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,006 | 1,456
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,226 | 3,945
Commercial and Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,896,824 | 3,566,987
Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,526,625 | 3,294,891
Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 140,345 | 89,302
Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 185,342 | 180,772
Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 44,512 | 2,022
Fund Banking [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,762,960 | 3,633,126
Fund Banking [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 3,762,960 | 3,633,126
Securities-Based Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,273,246 | 2,306,455
Securities-Based Loans [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,273,246 | 2,306,452
Securities-Based Loans [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio |  | 3
Construction And Land [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 1,219,787 | 1,034,370
Construction And Land [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 1,171,438 | 963,083
Construction And Land [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio |  | 71,287
Construction And Land [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 48,349 |
Commercial Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 565,686 | 660,631
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 462,443 | 512,171
Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 11,980 | 49,264
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 56,450 | 99,196
Commercial Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 34,813 |
Home Equity Lines Of Credit [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 170,732 | 136,270
Home Equity Lines Of Credit [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 170,070 | 135,806
Home Equity Lines Of Credit [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 94 | 377
Home Equity Lines Of Credit [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 568 | 87
Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 53,414 | 55,981
Other [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 53,338 | 55,922
Other [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | $ 76 |
Other [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio |  | $ 59

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