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Bank Loans (Risk Category of Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | $ 20,452,389 | $ 20,602,558
Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 20,063,652 | 20,427,527
Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 177,943 | 108,027
Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 199,982 | 56,899
Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 10,812 | 10,105
Residential Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 7,957,027 | 7,371,671
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 7,955,487 | 7,370,717
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 | 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 | 1,540 | 688
Commercial and Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,367,671 | 4,897,176
Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,122,791 | 4,743,290
Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 75,483 | 87,761
Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 160,164 | 56,899
Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 9,233 | 9,226
Fund Banking [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,114,889 | 4,182,641
Fund Banking [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,114,889 | 4,182,641
Fund Banking [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Fund Banking [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Fund Banking [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Securities-Based Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 2,317,631 | 2,724,551
Securities-Based Loans [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 2,317,629 | 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 | 2 | 3
Commercial Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 670,907 | 675,599
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 553,124 | 655,599
Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 77,979 | 20,000
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 39,804 |
Construction and Land [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 851,709 | 593,191
Construction and Land [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 827,228 | 593,191
Construction and Land [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 24,481 |
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 |
Home Equity Lines of Credit [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 123,995 | 107,136
Home Equity Lines of Credit [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 123,973 | 106,954
Home Equity Lines of Credit [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
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 | 22 | 182
Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 48,560 | 50,593
Other [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 48,531 | 50,587
Other [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Other [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 14 |
Other [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | $ 15 | $ 6

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