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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, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 19,554,758 |  | $ 19,441,467 |  |  |
Loans in process/(unapplied loan payments), net | (67,194) |  | 1,108 |  |  |
Unamortized loan fees, net | (5,483) |  | (8,478) |  |  |
Allowance for loan losses | (135,114) | $ (130,213) | (128,292) | $ (122,681) | $ (117,162) | $ (111,653)
Loans held for investment, net | $ 19,346,967 |  | $ 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 | $ 8,253,851 |  | $ 8,047,647 |  |  |
Allowance for loan losses | $ (11,242) | (12,507) | $ (13,855) | (14,413) | (22,696) | (20,441)
Gross bank loans, Percent | 42.20% |  | 41.40% |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 3,689,379 |  | $ 3,566,987 |  |  |
Allowance for loan losses | $ (76,354) | (65,887) | $ (67,077) | (66,377) | (55,734) | (54,143)
Gross bank loans, Percent | 18.90% |  | 18.30% |  |  |
Fund Banking [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 3,346,785 |  | $ 3,633,126 |  |  |
Allowance for loan losses | $ (12,179) | (8,763) | $ (10,173) | (12,178) | (12,943) | (11,711)
Gross bank loans, Percent | 17.10% |  | 18.70% |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 2,253,045 |  | $ 2,306,455 |  |  |
Allowance for loan losses | $ (2,813) | (3,068) | $ (3,035) | (3,086) | (3,117) | (3,157)
Gross bank loans, Percent | 11.50% |  | 11.90% |  |  |
Construction And Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 1,198,395 |  | $ 1,034,370 |  |  |
Allowance for loan losses | $ (16,379) | (18,589) | $ (11,817) | (12,645) | (10,317) | (8,568)
Gross bank loans, Percent | 6.10% |  | 5.30% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 608,911 |  | $ 660,631 |  |  |
Allowance for loan losses | $ (15,312) | (20,689) | $ (21,386) | (13,429) | (11,566) | (12,897)
Gross bank loans, Percent | 3.10% |  | 3.40% |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 158,472 |  | $ 136,270 |  |  |
Allowance for loan losses | $ (362) | (246) | $ (371) | (168) | (412) | (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 | $ 45,920 |  | $ 55,981 |  |  |
Allowance for loan losses | $ (473) | $ (464) | $ (578) | $ (385) | $ (377) | $ (372)
Gross bank loans, Percent | 0.30% |  | 0.30% |  |  |

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