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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% |  |  |

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