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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 19,441,467 | $ 20,602,558 |
Loans in process | 1,108 | (3,526) |
Unamortized loan fees, net | (8,478) | (22,287) |
Allowance for loan losses | (128,292) | (111,653) | $ (99,344)
Loans held for investment, net | $ 19,305,805 | $ 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 | $ 8,047,647 | $ 7,371,671 |
Allowance for loan losses | $ (13,855) | $ (20,441) | (28,560)
Gross bank loans, Percent | 41.40% | 35.80% |
Fund Banking [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 3,633,126 | $ 4,182,641 |
Allowance for loan losses | $ (10,173) | $ (11,711) | (8,868)
Gross bank loans, Percent | 18.70% | 20.30% |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 3,566,987 | $ 4,897,176 |
Allowance for loan losses | $ (67,077) | $ (54,143) | (44,661)
Gross bank loans, Percent | 18.30% | 23.80% |
Securities-Based Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 2,306,455 | $ 2,724,551 |
Allowance for loan losses | $ (3,035) | $ (3,157) | (4,006)
Gross bank loans, Percent | 11.90% | 13.20% |
Construction And Land [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 1,034,370 | $ 593,191 |
Allowance for loan losses | $ (11,817) | $ (8,568) | (8,536)
Gross bank loans, Percent | 5.30% | 2.90% |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 660,631 | $ 675,599 |
Allowance for loan losses | $ (21,386) | $ (12,897) | (3,934)
Gross bank loans, Percent | 3.40% | 3.30% |
Home Equity Lines Of Credit [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 136,270 | $ 107,136 |
Allowance for loan losses | $ (371) | $ (364) | (511)
Gross bank loans, Percent | 0.70% | 0.50% |
Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 55,981 | $ 50,593 |
Allowance for loan losses | $ (578) | $ (372) | $ (268)
Gross bank loans, Percent | 0.30% | 0.20% |

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