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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 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total risk category of loan portfolio | $ 20,879,745 | $ 19,441,467 |
Loans in process/(unapplied loan payments), net | (2,885) | 1,108 |
Unamortized loan fees, net | (5,756) | (8,478) |
Allowance for loan losses | (139,308) | (128,292) | $ (111,653)
Loans held for investment, net | $ 20,731,796 | $ 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 | $ 8,565,193 | $ 8,047,647 |
Allowance for loan losses | $ (11,061) | $ (13,855) | (20,441)
Gross bank loans, Percent | 41.00% | 41.40% |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total risk category of loan portfolio | $ 4,062,029 | $ 3,566,987 |
Allowance for loan losses | $ (92,698) | $ (67,077) | (54,143)
Gross bank loans, Percent | 19.50% | 18.30% |
Fund Banking [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total risk category of loan portfolio | $ 3,854,222 | $ 3,633,126 |
Allowance for loan losses | $ (10,792) | $ (10,173) | (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 | $ 2,389,593 | $ 2,306,455 |
Allowance for loan losses | $ (2,917) | $ (3,035) | (3,157)
Gross bank loans, Percent | 11.40% | 11.90% |
Construction And Land [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total risk category of loan portfolio | $ 1,242,002 | $ 1,034,370 |
Allowance for loan losses | $ (12,866) | $ (11,817) | (8,568)
Gross bank loans, Percent | 5.90% | 5.30% |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total risk category of loan portfolio | $ 518,923 | $ 660,631 |
Allowance for loan losses | $ (8,057) | $ (21,386) | (12,897)
Gross bank loans, Percent | 2.50% | 3.40% |
Home Equity Lines Of Credit [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total risk category of loan portfolio | $ 193,850 | $ 136,270 |
Allowance for loan losses | $ (317) | $ (371) | (364)
Gross bank loans, Percent | 0.90% | 0.70% |
Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total risk category of loan portfolio | $ 53,933 | $ 55,981 |
Allowance for loan losses | $ (600) | $ (578) | $ (372)
Gross bank loans, Percent | 0.30% | 0.30% |

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