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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, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 19,158,620   $ 16,743,487      
Unamortized loan discount, net 0   (150)      
Loans in process (53,332)   (10,134)      
Unamortized loan fees, net 14,620   (6,012)      
Allowance for loan losses (107,482) $ (104,198) (99,344) $ (99,196) $ (107,668) $ (112,029)
Loans held for investment, net $ 18,983,186   $ 16,627,847      
Gross bank loans, Percent 100.00%   100.00%      
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 8,347,410   $ 7,345,753      
Allowance for loan losses $ (67,352) (54,580) $ (53,529) (46,943) (56,316) (67,222)
Gross bank loans, Percent 43.60%   43.90%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 6,607,825   $ 5,482,026      
Allowance for loan losses $ (22,615) (32,927) $ (28,560) (21,267) (16,665) (16,300)
Gross bank loans, Percent 34.50%   32.70%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 2,993,552   $ 2,880,158      
Allowance for loan losses $ (3,976) (3,976) $ (4,006) (2,519) (2,169) (2,015)
Gross bank loans, Percent 15.60%   17.20%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 432,039   $ 511,084      
Allowance for loan losses $ (5,854) (8,121) $ (8,536) (15,953) (18,873) (17,275)
Gross bank loans, Percent 2.30%   3.10%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 629,459   $ 409,847      
Allowance for loan losses $ (6,483) (3,680) $ (3,934) (11,903) (13,060) (8,580)
Gross bank loans, Percent 3.30%   2.40%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 103,096   $ 82,508      
Allowance for loan losses $ (922) (683) $ (511) (426) (341) (374)
Gross bank loans, Percent 0.50%   0.50%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 45,239   $ 32,111      
Allowance for loan losses $ (280) $ (231) $ (268) $ (185) $ (244) $ (263)
Gross bank loans, Percent 0.20%   0.20%