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Bank Loans (Aging of the Recorded Investment in Past Due Loans) (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable Recorded Investment Past Due [Line Items]    
Total $ 21,177,141,000 $ 20,879,745,000
Non-accrual 109,019,000 [1] 77,966,000 [2]
Nonperforming loans with no allowance 50,055,000 [1] 82,934,000 [2]
Total 159,074,000 [1] 160,900,000 [2]
Loans past due 90 days and still accruing interest 0 0
30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 21,428,000 72,100,000
90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 92,429,000 31,856,000
Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 113,857,000 103,956,000
Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 21,063,284,000 20,775,789,000
Residential Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 9,085,945,000 8,565,193,000
Non-accrual 5,049,000 [1] 1,433,000 [2]
Nonperforming loans with no allowance 7,452,000 [1] 2,463,000 [2]
Total 12,501,000 [1] 3,896,000 [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 4,540,000 12,057,000
Residential Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 12,501,000 4,273,000
Residential Real Estate [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 17,041,000 16,330,000
Residential Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 9,068,904,000 8,548,863,000
Fund Banking [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 3,881,895,000 3,854,222,000
Fund Banking [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 0  
Fund Banking [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 3,881,895,000 3,854,222,000
Commercial and Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 3,760,005,000 4,062,029,000
Non-accrual 103,505,000 [1] 76,254,000 [2]
Nonperforming loans with no allowance 2,336,000 [1] 13,504,000 [2]
Total 105,841,000 [1] 89,758,000 [2]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 16,185,000 59,396,000
Commercial and Industrial [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 78,341,000 27,190,000
Commercial and Industrial [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 94,526,000 86,586,000
Commercial and Industrial [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 3,665,479,000 3,975,443,000
Securities-Based Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 2,565,897,000 2,389,593,000
Securities-Based Loans [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 90,000  
Securities-Based Loans [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 90,000  
Securities-Based Loans [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 2,565,807,000 2,389,593,000
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 437,570,000 518,923,000
Nonperforming loans with no allowance [2]   25,441,000
Total [2]   25,441,000
Commercial Real Estate [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 437,570,000 518,923,000
Construction And Land [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 1,166,895,000 1,242,002,000
Nonperforming loans with no allowance 39,145,000 [1] 41,412,000 [2]
Total 39,145,000 [1] 41,412,000 [2]
Construction And Land [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 1,166,895,000 1,242,002,000
Home Equity Lines Of Credit [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 218,320,000 193,850,000
Non-accrual 409,000 [1] 201,000 [2]
Nonperforming loans with no allowance 1,095,000 [1] 114,000 [2]
Total 1,504,000 [1] 315,000 [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 574,000 640,000
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 1,504,000 315,000
Home Equity Lines Of Credit [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 2,078,000 955,000
Home Equity Lines Of Credit [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 216,242,000 192,895,000
Other [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 60,614,000 53,933,000
Non-accrual 56,000 [1] 78,000 [2]
Nonperforming loans with no allowance [1] 27,000  
Total 83,000 [1] 78,000 [2]
Other [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 39,000 7,000
Other [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 83,000 78,000
Other [Member] | Financial Asset, Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total 122,000 85,000
Other [Member] | Current Balance [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total $ 60,492,000 $ 53,848,000
[1] There were no loans past due 90 days and still accruing interest at September 30, 2025.
[2] There were no loans past due 90 days and still accruing interest at December 31, 2024.