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Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Bank Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 20,372,268 $ 20,879,745    
Loans in process/(unapplied loan payments), net (3,671) (2,885)    
Unamortized loan fees, net (3,263) (5,756)    
Allowance for credit losses on loans (140,061) (139,308) $ (130,213) $ (128,292)
Loans held for investment, net $ 20,225,273 $ 20,731,796    
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 $ 8,699,229 $ 8,565,193    
Allowance for credit losses on loans $ (11,172) $ (11,061) (12,507) (13,855)
Gross bank loans, Percent 42.70% 41.00%    
Commercial and Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 3,678,411 $ 4,062,029    
Allowance for credit losses on loans $ (92,294) $ (92,698) (65,887) (67,077)
Gross bank loans, Percent 18.10% 19.50%    
Fund Banking [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 3,659,294 $ 3,854,222    
Allowance for credit losses on loans $ (10,246) $ (10,792) (8,763) (10,173)
Gross bank loans, Percent 18.00% 18.50%    
Securities-Based Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 2,404,960 $ 2,389,593    
Allowance for credit losses on loans $ (2,928) $ (2,917) (3,068) (3,035)
Gross bank loans, Percent 11.80% 11.40%    
Construction And Land [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 1,206,876 $ 1,242,002    
Allowance for credit losses on loans $ (13,251) $ (12,866) (18,589) (11,817)
Gross bank loans, Percent 5.90% 5.90%    
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 472,550 $ 518,923    
Allowance for credit losses on loans $ (9,366) $ (8,057) (20,689) (21,386)
Gross bank loans, Percent 2.30% 2.50%    
Home Equity Lines Of Credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 195,811 $ 193,850    
Allowance for credit losses on loans $ (170) $ (317) (246) (371)
Gross bank loans, Percent 1.00% 0.90%    
Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 55,137 $ 53,933    
Allowance for credit losses on loans $ (634) $ (600) $ (464) $ (578)
Gross bank loans, Percent 0.20% 0.30%