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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, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 20,822,285 |  | $ 20,879,745 |  |  |
Loans in process/(unapplied loan payments), net | (11,437) |  | (2,885) |  |  |
Unamortized loan fees, net | (28,020) |  | (5,756) |  |  |
Allowance for credit losses on loans | (135,734) | $ (140,061) | (139,308) | $ (135,114) | $ (130,213) | $ (128,292)
Loans held for investment, net | $ 20,647,094 |  | $ 20,731,796 |  |  |
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 | $ 8,906,739 |  | $ 8,565,193 |  |  |
Allowance for credit losses on loans | $ (13,767) | (11,172) | $ (11,061) | (11,242) | (12,507) | (13,855)
Gross bank loans, Percent | 42.80% |  | 41.00% |  |  |
Fund Banking [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 3,910,070 |  | $ 3,854,222 |  |  |
Allowance for credit losses on loans | $ (10,948) | (10,246) | $ (10,792) | (12,179) | (8,763) | (10,173)
Gross bank loans, Percent | 18.80% |  | 18.50% |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 3,536,227 |  | $ 4,062,029 |  |  |
Allowance for credit losses on loans | $ (84,981) | (92,294) | $ (92,698) | (76,354) | (65,887) | (67,077)
Gross bank loans, Percent | 17.00% |  | 19.50% |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 2,568,050 |  | $ 2,389,593 |  |  |
Allowance for credit losses on loans | $ (3,128) | (2,928) | $ (2,917) | (2,813) | (3,068) | (3,035)
Gross bank loans, Percent | 12.30% |  | 11.40% |  |  |
Construction And Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 1,217,561 |  | $ 1,242,002 |  |  |
Allowance for credit losses on loans | $ (12,854) | (13,251) | $ (12,866) | (16,379) | (18,589) | (11,817)
Gross bank loans, Percent | 5.80% |  | 5.90% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 429,243 |  | $ 518,923 |  |  |
Allowance for credit losses on loans | $ (8,795) | (9,366) | $ (8,057) | (15,312) | (20,689) | (21,386)
Gross bank loans, Percent | 2.10% |  | 2.50% |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 212,681 |  | $ 193,850 |  |  |
Allowance for credit losses on loans | $ (660) | (170) | $ (317) | (362) | (246) | (371)
Gross bank loans, Percent | 1.00% |  | 0.90% |  |  |
Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total risk category of loan portfolio | $ 41,714 |  | $ 53,933 |  |  |
Allowance for credit losses on loans | $ (601) | $ (634) | $ (600) | $ (473) | $ (464) | $ (578)
Gross bank loans, Percent | 0.20% |  | 0.30% |  |  |

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