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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, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 10,574,297   $ 9,752,616      
Unamortized loan discount, net (8,184)   (6,588)      
Loans in process (2,920)   (27,717)      
Unamortized loan fees, net 941   1,310      
Allowance for loan losses (115,821) $ (102,802) (95,579) $ (90,472) $ (88,172) $ (85,833)
Loans held for investment, net $ 10,448,313   $ 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 $ 4,149,307   $ 3,438,953      
Allowance for loan losses $ (65,503) (59,962) $ (69,949) (69,263) (68,566) (68,367)
Gross bank loans, Percent 39.20%   35.30%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 3,710,657   $ 3,309,548      
Allowance for loan losses $ (24,043) (19,985) $ (14,253) (12,042) (11,585) (11,228)
Gross bank loans, Percent 35.10%   33.90%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 406,788   $ 428,549      
Allowance for loan losses $ (10,647) (8,165) $ (3,564) (2,478) (2,421) (1,778)
Gross bank loans, Percent 3.80%   4.40%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 472,216   $ 398,839      
Allowance for loan losses $ (13,075) (10,953) $ (4,613) (2,402) (1,724) (1,241)
Gross bank loans, Percent 4.50%   4.10%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 62,699   $ 51,205      
Allowance for loan losses $ (499) (539) $ (442) (421) (372) (310)
Gross bank loans, Percent 0.60%   0.50%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 55,844   $ 27,311      
Allowance for loan losses $ (247) (283) $ (194) (179) (146) (88)
Gross bank loans, Percent 0.60%   0.30%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 1,716,786   $ 2,098,211      
Allowance for loan losses $ (1,807) $ (2,915) $ (2,361) $ (2,311) $ (2,227) $ (1,978)
Gross bank loans, Percent 16.20%   21.50%