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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 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 20,899,444 | $ 20,602,558 |  |
Loans in process | (51,795) | (3,526) |  |
Unamortized loan fees, net | (20,719) | (22,287) |  |
Allowance for loan losses | (117,162) | (111,653) | $ (104,198) | $ (99,344)
Loans held for investment, net | $ 20,709,768 | $ 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 | $ 7,494,788 | $ 7,371,671 |  |
Allowance for loan losses | $ (22,696) | $ (20,441) | (32,927) | (28,560)
Gross bank loans, Percent | 35.90% | 35.80% |  |
Commercial And Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 4,755,664 | $ 4,897,176 |  |
Allowance for loan losses | $ (55,734) | $ (54,143) | (46,188) | (44,661)
Gross bank loans, Percent | 22.80% | 23.80% |  |
Fund Banking [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 4,623,423 | $ 4,182,641 |  |
Allowance for loan losses | $ (12,943) | $ (11,711) | (8,392) | (8,868)
Gross bank loans, Percent | 22.10% | 20.30% |  |
Securities-Based Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 2,558,343 | $ 2,724,551 |  |
Allowance for loan losses | $ (3,117) | $ (3,157) | (3,976) | (4,006)
Gross bank loans, Percent | 12.20% | 13.20% |  |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 663,325 | $ 675,599 |  |
Allowance for loan losses | $ (11,566) | $ (12,897) | (3,680) | (3,934)
Gross bank loans, Percent | 3.20% | 3.30% |  |
Construction And Land [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 644,800 | $ 593,191 |  |
Allowance for loan losses | $ (10,317) | $ (8,568) | (8,121) | (8,536)
Gross bank loans, Percent | 3.10% | 2.90% |  |
Home Equity Lines Of Credit [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 109,197 | $ 107,136 |  |
Allowance for loan losses | $ (412) | $ (364) | (683) | (511)
Gross bank loans, Percent | 0.50% | 0.50% |  |
Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross bank loans | $ 49,904 | $ 50,593 |  |
Allowance for loan losses | $ (377) | $ (372) | $ (231) | $ (268)
Gross bank loans, Percent | 0.20% | 0.20% |  |

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