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Bank Loans (Activity in the Allowance for Credit Losses on Loans by Portfolio Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance $ 135,734 $ 135,114 $ 139,308 $ 128,292
Provision 8,808 9,208 29,216 20,598
Charge-offs (10,529) (6,972) (34,520) (12,473)
Recoveries 9   18 933
Ending Balance 134,022 137,350 134,022 137,350
Commercial and Industrial [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 84,981 76,354 92,698 67,077
Provision 11,378 10,321 27,652 22,476
Charge-offs (10,529) (6,813) (34,520) (10,624)
Recoveries       933
Ending Balance 85,830 79,862 85,830 79,862
Construction And Land [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 12,854 16,379 12,866 11,817
Provision (629) 3,396 (641) 7,958
Ending Balance 12,225 19,775 12,225 19,775
Commercial Real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 8,795 15,312 8,057 21,386
Provision (192) (2,997) 546 (7,381)
Charge-offs       (1,690)
Ending Balance 8,603 12,315 8,603 12,315
Residential Real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 13,767 11,242 11,061 13,855
Provision (1,258) 28 1,448 (2,585)
Ending Balance 12,509 11,270 12,509 11,270
Fund Banking [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 10,948 12,179 10,792 10,173
Provision (132) (1,642) 24 364
Ending Balance 10,816 10,537 10,816 10,537
Securities-Based Loans [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 3,128 2,813 2,917 3,035
Provision 52 40 263 (182)
Ending Balance 3,180 2,853 3,180 2,853
Home Equity Lines Of Credit [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 660 362 317 371
Provision (417) (143) (74) (152)
Ending Balance 243 219 243 219
Other [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Beginning Balance 601 473 600 578
Provision 6 205 (2) 100
Charge-offs   (159)   (159)
Recoveries 9   18  
Ending Balance $ 616 $ 519 $ 616 $ 519