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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, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 13,631,287   $ 11,170,813      
Unamortized loan discount, net (150)   (1,822)      
Loans in process (32,909)   (48,222)      
Unamortized loan fees, net (1,348)   (1,980)      
Allowance for loan losses (94,293) $ (99,196) (112,029) $ (114,113) $ (115,821) $ (95,579)
Loans held for investment, net $ 13,502,587   $ 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 $ 5,033,313   $ 4,296,089      
Allowance for loan losses $ (46,687) (46,943) $ (67,222) (75,809) (65,503) (69,949)
Gross bank loans, Percent 36.90%   38.50%      
Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,952,372   $ 3,956,670      
Allowance for loan losses $ (23,904) (21,267) $ (16,300) (17,683) (24,043) (14,253)
Gross bank loans, Percent 36.30%   35.40%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 369,502   $ 366,485      
Allowance for loan losses $ (5,321) (11,903) $ (8,580) (7,917) (10,647) (3,564)
Gross bank loans, Percent 2.70%   3.30%      
Construction And Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 576,362   $ 501,681      
Allowance for loan losses $ (14,333) (15,953) $ (17,275) (10,186) (13,075) (4,613)
Gross bank loans, Percent 4.20%   4.50%      
Home Equity Lines Of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 82,230   $ 75,507      
Allowance for loan losses $ (474) (426) $ (374) (381) (499) (442)
Gross bank loans, Percent 0.60%   0.70%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 35,803   $ 40,407      
Allowance for loan losses $ (247) (185) $ (263) (235) (247) (397)
Gross bank loans, Percent 0.30%   0.30%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 2,581,705   $ 1,933,974      
Allowance for loan losses $ (3,327) $ (2,519) $ (2,015) $ (1,902) $ (1,807) $ (2,361)
Gross bank loans, Percent 19.00%   17.30%