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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 20,602,558 | $ 16,743,487 |
Unamortized loan discount, net | 0 | (150) |
Loans in process | (3,526) | (10,134) |
Unamortized loan fees, net | (22,287) | (6,012) |
Allowance for loan losses | (111,653) | (99,344) | $ (112,029)
Loans held for investment, net | $ 20,465,092 | $ 16,627,847 |
Gross bank loans, Percent | 100.00% | 100.00% |
Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 7,371,671 | $ 5,482,026 |
Allowance for loan losses | $ (20,441) | $ (28,560) | (16,300)
Gross bank loans, Percent | 35.80% | 32.70% |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 4,897,176 | $ 4,208,950 |
Allowance for loan losses | $ (54,143) | $ (44,661) | (62,557)
Gross bank loans, Percent | 23.80% | 25.20% |
Fund Banking [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 4,182,641 | $ 3,136,803 |
Allowance for loan losses | $ (11,711) | $ (8,868) | (4,665)
Gross bank loans, Percent | 20.30% | 18.70% |
Securities-Based Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 2,724,551 | $ 2,880,158 |
Allowance for loan losses | $ (3,157) | $ (4,006) | (2,015)
Gross bank loans, Percent | 13.20% | 17.20% |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 675,599 | $ 409,847 |
Allowance for loan losses | $ (12,897) | $ (3,934) | (8,580)
Gross bank loans, Percent | 3.30% | 2.40% |
Construction And Land [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 593,191 | $ 511,084 |
Allowance for loan losses | $ (8,568) | $ (8,536) | (17,275)
Gross bank loans, Percent | 2.90% | 3.10% |
Home Equity Lines Of Credit [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 107,136 | $ 82,508 |
Allowance for loan losses | $ (364) | $ (511) | (374)
Gross bank loans, Percent | 0.50% | 0.50% |
Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 50,593 | $ 32,111 |
Allowance for loan losses | $ (372) | $ (268) | $ (263)
Gross bank loans, Percent | 0.20% | 0.20% |

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