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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 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 10,753,688 |  | $ 9,752,616 |  |  |
Unamortized loan discount, net | (2,260) |  | (6,588) |  |  |
Loans in process | 13,398 |  | (27,717) |  |  |
Unamortized loan fees, net | 47 |  | 1,310 |  |  |
Allowance for loan losses | (114,113) | $ (115,821) | (95,579) | $ (91,360) | $ (90,472) | $ (85,833)
Loans held for investment, net | $ 10,650,760 |  | $ 9,624,042 |  |  |
Gross bank loans, Percent | 100.00% |  | 100.00% |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 4,080,939 |  | $ 3,438,953 |  |  |
Allowance for loan losses | $ (75,809) | (65,503) | $ (69,949) | (68,172) | (69,263) | (68,367)
Gross bank loans, Percent | 37.90% |  | 35.30% |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 3,804,836 |  | $ 3,309,548 |  |  |
Allowance for loan losses | $ (17,683) | (24,043) | $ (14,253) | (12,562) | (12,042) | (11,228)
Gross bank loans, Percent | 35.40% |  | 33.90% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 386,957 |  | $ 428,549 |  |  |
Allowance for loan losses | $ (7,917) | (10,647) | $ (3,564) | (2,903) | (2,478) | (1,778)
Gross bank loans, Percent | 3.60% |  | 4.40% |  |  |
Construction And Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 532,319 |  | $ 398,839 |  |  |
Allowance for loan losses | $ (10,186) | (13,075) | $ (4,613) | (3,267) | (2,402) | (1,241)
Gross bank loans, Percent | 5.00% |  | 4.10% |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 67,386 |  | $ 51,205 |  |  |
Allowance for loan losses | $ (381) | (499) | $ (442) | (435) | (421) | (310)
Gross bank loans, Percent | 0.60% |  | 0.50% |  |  |
Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 39,735 |  | $ 27,311 |  |  |
Allowance for loan losses | $ (235) | (247) | $ (194) | (195) | (179) | (88)
Gross bank loans, Percent | 0.40% |  | 0.30% |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 1,841,516 |  | $ 2,098,211 |  |  |
Allowance for loan losses | $ (1,902) | $ (1,807) | $ (2,361) | $ (2,181) | $ (2,311) | $ (1,978)
Gross bank loans, Percent | 17.10% |  | 21.50% |  |  |

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