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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
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 10,753,688   $ 9,752,616      
Unamortized loan discount, net (2,260)   (6,588)      
Loans in process 13,398   (27,717)      
Unamortized loan fees, net 47   1,310      
Allowance for loan losses (114,113) $ (115,821) (95,579) $ (91,360) $ (90,472) $ (85,833)
Loans held for investment, net $ 10,650,760   $ 9,624,042      
Gross bank loans, Percent 100.00%   100.00%      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,080,939   $ 3,438,953      
Allowance for loan losses $ (75,809) (65,503) $ (69,949) (68,172) (69,263) (68,367)
Gross bank loans, Percent 37.90%   35.30%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 3,804,836   $ 3,309,548      
Allowance for loan losses $ (17,683) (24,043) $ (14,253) (12,562) (12,042) (11,228)
Gross bank loans, Percent 35.40%   33.90%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 386,957   $ 428,549      
Allowance for loan losses $ (7,917) (10,647) $ (3,564) (2,903) (2,478) (1,778)
Gross bank loans, Percent 3.60%   4.40%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 532,319   $ 398,839      
Allowance for loan losses $ (10,186) (13,075) $ (4,613) (3,267) (2,402) (1,241)
Gross bank loans, Percent 5.00%   4.10%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 67,386   $ 51,205      
Allowance for loan losses $ (381) (499) $ (442) (435) (421) (310)
Gross bank loans, Percent 0.60%   0.50%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 39,735   $ 27,311      
Allowance for loan losses $ (235) (247) $ (194) (195) (179) (88)
Gross bank loans, Percent 0.40%   0.30%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 1,841,516   $ 2,098,211      
Allowance for loan losses $ (1,902) $ (1,807) $ (2,361) $ (2,181) $ (2,311) $ (1,978)
Gross bank loans, Percent 17.10%   21.50%