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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 11,170,813 | $ 9,752,616 |
Unamortized loan discount, net | (1,822) | (6,588) |
Loans in process | (48,222) | (27,717) |
Unamortized loan fees, net | (1,980) | 1,310 |
Allowance for loan losses | (112,029) | (95,579) | $ (85,833)
Loans held for investment, net | $ 11,006,760 | $ 9,624,042 |
Gross bank loans, Percent | 100.00% | 100.00% |
Commercial And Industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 4,296,089 | $ 3,438,953 |
Allowance for loan losses | $ (67,222) | $ (69,949) | (68,367)
Gross bank loans, Percent | 38.50% | 35.30% |
Residential Mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 3,956,670 | $ 3,309,548 |
Allowance for loan losses | $ (16,300) | $ (14,253) | (11,228)
Gross bank loans, Percent | 35.40% | 33.90% |
Securities-Based Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 1,933,974 | $ 2,098,211 |
Allowance for loan losses | $ (2,015) | $ (2,361) | (1,978)
Gross bank loans, Percent | 17.30% | 21.50% |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 366,485 | $ 428,549 |
Allowance for loan losses | (8,580) | (3,564) | (1,778)
Construction And Land [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | 501,681 | 398,839 |
Allowance for loan losses | $ (17,275) | $ (4,613) | (1,241)
Gross bank loans, Percent | 4.50% | 4.10% |
Home Equity Lines Of Credit [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 75,507 | $ 51,205 |
Allowance for loan losses | $ (374) | $ (442) | (310)
Gross bank loans, Percent | 0.70% | 0.50% |
Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans | $ 40,407 | $ 27,311 |
Allowance for loan losses | $ (263) | $ (397) | $ (931)
Gross bank loans, Percent | 0.30% | 0.30% |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross bank loans, Percent | 3.30% | 4.40% |

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