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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, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 8,344,626   $ 7,014,421      
Unamortized loan premium/(discount), net (13,419)   788      
Loans in process (2,755)   (856)      
Unamortized loan fees, net 6,237   872      
Allowance for loan losses (80,700) $ (73,775) (67,466) $ (62,229) $ (54,202) $ (45,163)
Bank loans, net $ 8,253,989   $ 6,947,759      
Gross bank loans, Percent 100.00%   100.00%      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 3,127,435   $ 2,437,938      
Allowance for loan losses $ (64,580) (59,572) $ (54,474) (47,152) (40,805) (35,127)
Gross bank loans, Percent 37.50%   34.80%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 2,792,269   $ 2,593,576      
Allowance for loan losses $ (10,493) (9,328) $ (8,430) (7,135) (5,569) (2,660)
Gross bank loans, Percent 33.50%   37.00%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 1,836,450   $ 1,819,206      
Allowance for loan losses $ (1,923) (1,928) $ (2,088) (3,312) (3,600) (3,094)
Gross bank loans, Percent 22.00%   25.90%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 328,814   $ 116,258      
Allowance for loan losses $ (1,762) (1,672) $ (1,520) (1,027) (932) (1,363)
Gross bank loans, Percent 3.90%   1.70%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 29,118   $ 15,039      
Allowance for loan losses $ (229) (229) $ (162) (271) (283) (371)
Gross bank loans, Percent 0.30%   0.20%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 120,969   $ 7,896      
Allowance for loan losses $ (903) (303) $ (100) (233) (224) (232)
Gross bank loans, Percent 1.40%   0.10%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 109,571   $ 24,508      
Allowance for loan losses $ (11) $ (13) $ (16) $ (103) $ (105) $ (129)
Gross bank loans, Percent 1.40%   0.30%