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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, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 20,349,581 |  | $ 19,441,467 |  |  |
Loans in process/(unapplied loan payments), net | (38,825) |  | 1,108 |  |  |
Unamortized loan fees, net | (5,720) |  | (8,478) |  |  |
Allowance for loan losses | (137,350) | $ (135,114) | (128,292) | $ (135,797) | $ (122,681) | $ (111,653)
Loans held for investment, net | $ 20,167,686 |  | $ 19,305,805 |  |  |
Gross bank loans, Percent | 100.00% |  | 100.00% |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 8,406,932 |  | $ 8,047,647 |  |  |
Allowance for loan losses | $ (11,270) | (11,242) | $ (13,855) | (14,607) | (14,413) | (20,441)
Gross bank loans, Percent | 41.30% |  | 41.40% |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 3,896,824 |  | $ 3,566,987 |  |  |
Allowance for loan losses | $ (79,862) | (76,354) | $ (67,077) | (74,659) | (66,377) | (54,143)
Gross bank loans, Percent | 19.10% |  | 18.30% |  |  |
Fund Banking [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 3,762,960 |  | $ 3,633,126 |  |  |
Allowance for loan losses | $ (10,537) | (12,179) | $ (10,173) | (11,518) | (12,178) | (11,711)
Gross bank loans, Percent | 18.50% |  | 18.70% |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 2,273,246 |  | $ 2,306,455 |  |  |
Allowance for loan losses | $ (2,853) | (2,813) | $ (3,035) | (3,018) | (3,086) | (3,157)
Gross bank loans, Percent | 11.20% |  | 11.90% |  |  |
Construction And Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 1,219,787 |  | $ 1,034,370 |  |  |
Allowance for loan losses | $ (19,775) | (16,379) | $ (11,817) | (11,500) | (12,645) | (8,568)
Gross bank loans, Percent | 6.00% |  | 5.30% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 565,686 |  | $ 660,631 |  |  |
Allowance for loan losses | $ (12,315) | (15,312) | $ (21,386) | (19,866) | (13,429) | (12,897)
Gross bank loans, Percent | 2.80% |  | 3.40% |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 170,732 |  | $ 136,270 |  |  |
Allowance for loan losses | $ (219) | (362) | $ (371) | (195) | (168) | (364)
Gross bank loans, Percent | 0.80% |  | 0.70% |  |  |
Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 53,414 |  | $ 55,981 |  |  |
Allowance for loan losses | $ (519) | $ (473) | $ (578) | $ (434) | $ (385) | $ (372)
Gross bank loans, Percent | 0.30% |  | 0.30% |  |  |

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