v3.26.1
Bank Loans (Activity in the Allowance for Credit Losses on Loans by Portfolio Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance $ 132,245 $ 139,308
Provision 7,687 12,551
Charge-offs (24,755) (11,806)
Recoveries 1 8
Ending Balance 115,178 140,061
Commercial and Industrial [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 92,612 92,698
Provision 8,924 11,402
Charge-offs (24,755) (11,806)
Ending Balance 76,781 92,294
Commercial Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 5,650 8,057
Provision 1 1,309
Ending Balance 5,651 9,366
Residential Real Estate [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 11,264 11,061
Provision (276) 111
Ending Balance 10,988 11,172
Construction And Land [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 10,567 12,866
Provision (272) 385
Ending Balance 10,295 13,251
Fund Banking [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 8,193 10,792
Provision (718) (546)
Ending Balance 7,475 10,246
Securities-Based Loans [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 3,254 2,917
Provision 46 11
Ending Balance 3,300 2,928
Home Equity Lines Of Credit [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 134 317
Provision (14) (147)
Ending Balance 120 170
Other [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Beginning Balance 571 600
Provision (4) 26
Recoveries 1 8
Ending Balance $ 568 $ 634