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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, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 9,066,278   $ 8,581,647      
Unamortized loan discount, net (11,265)   (12,155)      
Loans in process (1,596)   27,984      
Unamortized loan fees, net 1,380   5,972      
Allowance for loan losses (90,472) $ (88,172) (85,833) $ (73,775) $ (69,497) $ (67,466)
Bank loans, net $ 8,964,325   $ 8,517,615      
Gross bank loans, Percent 100.00%   100.00%      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 3,338,127   $ 3,304,234      
Allowance for loan losses $ (69,263) (68,566) $ (68,367) (59,572) (56,433) (54,474)
Gross bank loans, Percent 36.80%   38.50%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 2,984,725   $ 2,875,014      
Allowance for loan losses $ (12,042) (11,585) $ (11,228) (9,328) (8,779) (8,430)
Gross bank loans, Percent 32.90%   33.50%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 1,962,528   $ 1,786,966      
Allowance for loan losses $ (2,311) (2,227) $ (1,978) (1,928) (1,894) (2,088)
Gross bank loans, Percent 21.60%   20.80%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 367,283   $ 318,961      
Allowance for loan losses $ (2,478) (2,421) $ (1,778) (1,672) (1,320) (1,520)
Gross bank loans, Percent 4.10%   3.70%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 226,559   $ 138,245      
Allowance for loan losses $ (2,402) (1,724) $ (1,241) (303) (199) (100)
Gross bank loans, Percent 2.50%   1.60%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 49,209   $ 38,098      
Allowance for loan losses $ (421) (372) $ (310) (229) (164) (162)
Gross bank loans, Percent 0.50%   0.40%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 137,847   $ 120,129      
Allowance for loan losses $ (179) $ (146) $ (88) $ (13) $ (15) $ (16)
Gross bank loans, Percent 1.60%   1.50%