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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, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 20,452,389   $ 20,602,558      
Loans in process (8,509)   (3,526)      
Unamortized loan fees, net (15,530)   (22,287)      
Allowance for loan losses (135,797) $ (122,681) (111,653) $ (105,024) $ (107,482) $ (99,344)
Loans held for investment, net $ 20,292,553   $ 20,465,092      
Gross bank loans, Percent 100.00%   100.00%      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 7,957,027   $ 7,371,671      
Allowance for loan losses $ (14,607) (14,413) $ (20,441) (17,465) (22,615) (28,560)
Gross bank loans, Percent 38.90%   35.80%      
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,367,671   $ 4,897,176      
Allowance for loan losses $ (74,659) (66,377) $ (54,143) (52,075) (57,594) (44,661)
Gross bank loans, Percent 21.40%   23.80%      
Fund Banking [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 4,114,889   $ 4,182,641      
Allowance for loan losses $ (11,518) (12,178) $ (11,711) (12,172) (9,758) (8,868)
Gross bank loans, Percent 20.10%   20.30%      
Securities-Based Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 2,317,631   $ 2,724,551      
Allowance for loan losses $ (3,018) (3,086) $ (3,157) (3,318) (3,976) (4,006)
Gross bank loans, Percent 11.30%   13.20%      
Construction and Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 851,709   $ 593,191      
Allowance for loan losses $ (11,500) (12,645) $ (8,568) (7,529) (5,854) (8,536)
Gross bank loans, Percent 4.20%   2.90%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 670,907   $ 675,599      
Allowance for loan losses $ (19,866) (13,429) $ (12,897) (11,963) (6,483) (3,934)
Gross bank loans, Percent 3.30%   3.30%      
Home Equity Lines of Credit [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 123,995   $ 107,136      
Allowance for loan losses $ (195) (168) $ (364) (198) (922) (511)
Gross bank loans, Percent 0.60%   0.50%      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross bank loans $ 48,560   $ 50,593      
Allowance for loan losses $ (434) $ (385) $ (372) $ (304) $ (280) $ (268)
Gross bank loans, Percent 0.20%   0.20%