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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, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 19,091,860 $ 19,441,467    
Loans in process (3,659) 1,108    
Unamortized loan fees, net (8,192) (8,478)    
Allowance for loan losses (130,213) (128,292) $ (117,162) $ (111,653)
Loans held for investment, net $ 18,949,796 $ 19,305,805    
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 $ 8,096,975 $ 8,047,647    
Allowance for loan losses $ (12,507) $ (13,855) (22,696) (20,441)
Gross bank loans, Percent 42.40% 41.40%    
Commercial And Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 3,541,770 $ 3,566,987    
Allowance for loan losses $ (65,887) $ (67,077) (55,734) (54,143)
Gross bank loans, Percent 18.60% 18.30%    
Fund Banking [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 3,129,642 $ 3,633,126    
Allowance for loan losses $ (8,763) $ (10,173) (12,943) (11,711)
Gross bank loans, Percent 16.40% 18.70%    
Securities-Based Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 2,302,250 $ 2,306,455    
Allowance for loan losses $ (3,068) $ (3,035) (3,117) (3,157)
Gross bank loans, Percent 12.10% 11.90%    
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 655,355 $ 660,631    
Allowance for loan losses $ (20,689) $ (21,386) (11,566) (12,897)
Gross bank loans, Percent 3.40% 3.40%    
Construction And Land [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 1,167,300 $ 1,034,370    
Allowance for loan losses $ (18,589) $ (11,817) (10,317) (8,568)
Gross bank loans, Percent 6.10% 5.30%    
Home Equity Lines Of Credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 150,452 $ 136,270    
Allowance for loan losses $ (246) $ (371) (412) (364)
Gross bank loans, Percent 0.80% 0.70%    
Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total risk category of loan portfolio $ 48,116 $ 55,981    
Allowance for loan losses $ (464) $ (578) $ (377) $ (372)
Gross bank loans, Percent 0.20% 0.30%