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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
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 20,532,967   $ 20,602,558      
Loans in process (52,379)   (3,526)      
Unamortized loan fees, net (19,432)   (22,287)      
Allowance for loan losses (122,681) $ (117,162) (111,653) $ (107,482) $ (104,198) $ (99,344)
Loans held for investment, net $ 20,338,475   $ 20,465,092      
Gross bank loans, Percent 100.00%   100.00%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 7,708,506   $ 7,371,671      
Allowance for loan losses $ (14,413) (22,696) $ (20,441) (22,615) (32,927) (28,560)
Gross bank loans, Percent 37.50%   35.80%      
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,471,031   $ 4,897,176      
Allowance for loan losses $ (66,377) (55,734) $ (54,143) (57,594) (46,188) (44,661)
Gross bank loans, Percent 21.80%   23.80%      
Fund Banking [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,349,541   $ 4,182,641      
Allowance for loan losses $ (12,178) (12,943) $ (11,711) (9,758) (8,392) (8,868)
Gross bank loans, Percent 21.20%   20.30%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 2,399,328   $ 2,724,551      
Allowance for loan losses $ (3,086) (3,117) $ (3,157) (3,976) (3,976) (4,006)
Gross bank loans, Percent 11.70%   13.20%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 772,571   $ 593,191      
Allowance for loan losses $ (12,645) (10,317) $ (8,568) (5,854) (8,121) (8,536)
Gross bank loans, Percent 3.80%   2.90%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 677,521   $ 675,599      
Allowance for loan losses $ (13,429) (11,566) $ (12,897) (6,483) (3,680) (3,934)
Gross bank loans, Percent 3.30%   3.30%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 110,766   $ 107,136      
Allowance for loan losses $ (168) (412) $ (364) (922) (683) (511)
Gross bank loans, Percent 0.50%   0.50%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 43,703   $ 50,593      
Allowance for loan losses $ (385) $ (377) $ (372) $ (280) $ (231) $ (268)
Gross bank loans, Percent 0.20%   0.20%