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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, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 12,898,807   $ 11,170,813      
Unamortized loan discount, net (1,652)   (1,822)      
Loans in process (25,447)   (48,222)      
Unamortized loan fees, net (1,571)   (1,980)      
Allowance for loan losses (99,196) $ (107,668) (112,029) $ (115,821) $ (102,802) $ (95,579)
Loans held for investment, net $ 12,770,941   $ 11,006,760      
Gross bank loans, Percent 100.00%   100.00%      
Commercial And Industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,950,516   $ 4,296,089      
Allowance for loan losses $ (46,943) (56,316) $ (67,222) (65,503) (59,962) (69,949)
Gross bank loans, Percent 38.40%   38.50%      
Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,567,467   $ 3,956,670      
Allowance for loan losses $ (21,267) (16,665) $ (16,300) (24,043) (19,985) (14,253)
Gross bank loans, Percent 35.40%   35.40%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 370,517   $ 366,485      
Allowance for loan losses $ (11,903) (13,060) $ (8,580) (10,647) (8,165) (3,564)
Gross bank loans, Percent 2.90%   3.30%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 563,552   $ 501,681      
Allowance for loan losses $ (15,953) (18,873) $ (17,275) (13,075) (10,953) (4,613)
Gross bank loans, Percent 4.40%   4.50%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 76,839   $ 75,507      
Allowance for loan losses $ (426) (341) $ (374) (499) (539) (442)
Gross bank loans, Percent 0.60%   0.70%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 38,179   $ 40,407      
Allowance for loan losses $ (185) (244) $ (263) (247) (283) (397)
Gross bank loans, Percent 0.20%   0.30%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 2,331,737   $ 1,933,974      
Allowance for loan losses $ (2,519) $ (2,169) $ (2,015) $ (1,807) $ (2,915) $ (2,361)
Gross bank loans, Percent 18.10%   17.30%