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Bank Loans (Risk Category Of Loan Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | $ 20,899,444 | $ 20,602,558
Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 20,666,331 | 20,427,527
Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 145,274 | 108,027
Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 77,664 | 56,899
Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 10,175 | 10,105
Residential Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 7,494,788 | 7,371,671
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 7,494,068 | 7,370,717
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 104 | 266
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Residential Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 616 | 688
Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,755,664 | 4,897,176
Commercial And Industrial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,583,114 | 4,743,290
Commercial And Industrial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 85,336 | 87,761
Commercial And Industrial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 77,664 | 56,899
Commercial And Industrial [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 9,550 | 9,226
Fund Banking [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,623,423 | 4,182,641
Fund Banking [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,623,423 | 4,182,641
Securities-Based Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 2,558,343 | 2,724,551
Securities-Based Loans [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 2,558,340 | 2,724,548
Securities-Based Loans [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Securities-Based Loans [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Securities-Based Loans [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 3 | 3
Commercial Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 663,325 | 675,599
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 603,816 | 655,599
Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 59,509 | 20,000
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Commercial Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Construction And Land [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 644,800 | 593,191
Construction And Land [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 644,800 | 593,191
Construction And Land [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Construction And Land [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Construction And Land [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 | 182
Home Equity Lines Of Credit [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 109,197 | 107,136
Home Equity Lines Of Credit [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 108,886 | 106,954
Home Equity Lines Of Credit [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 311 |
Home Equity Lines Of Credit [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Home Equity Lines Of Credit [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 49,904 | 50,593
Other [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 49,884 | 50,587
Other [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 14 |
Other [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Other [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | $ 6 | $ 6

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