v3.26.1
Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Bank Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 21,963,460 $ 22,066,763    
Loans in process/(unapplied loan payments), net (10,549) (10,779)    
Unamortized loan fees, net (746) 1,518    
Allowance for credit losses on loans (115,178) (132,245) $ (140,061) $ (139,308)
Loans held for investment, net $ 21,836,987 $ 21,925,257    
Gross bank loans, Percent 100.00% 100.00%    
Residential Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 9,363,547 $ 9,254,939    
Allowance for credit losses on loans $ (10,988) $ (11,264) (11,172) (11,061)
Gross bank loans, Percent 42.60% 41.90%    
Commercial and Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 4,170,090 $ 4,135,091    
Allowance for credit losses on loans $ (76,781) $ (92,612) (92,294) (92,698)
Gross bank loans, Percent 19.00% 18.70%    
Fund Banking [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 3,737,366 $ 4,096,649    
Allowance for credit losses on loans $ (7,475) $ (8,193) (10,246) (10,792)
Gross bank loans, Percent 17.00% 18.60%    
Securities-Based Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 2,749,987 $ 2,672,431    
Allowance for credit losses on loans $ (3,300) $ (3,254) (2,928) (2,917)
Gross bank loans, Percent 12.50% 12.10%    
Construction And Land [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 1,229,903 $ 1,214,450    
Allowance for credit losses on loans $ (10,295) $ (10,567) (13,251) (12,866)
Gross bank loans, Percent 5.60% 5.50%    
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 440,993 $ 423,474    
Allowance for credit losses on loans $ (5,651) $ (5,650) (9,366) (8,057)
Gross bank loans, Percent 2.00% 1.90%    
Home Equity Lines Of Credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 233,334 $ 225,196    
Allowance for credit losses on loans $ (120) $ (134) (170) (317)
Gross bank loans, Percent 1.10% 1.00%    
Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 38,240 $ 44,533    
Allowance for credit losses on loans $ (568) $ (571) $ (634) $ (600)
Gross bank loans, Percent 0.20% 0.30%