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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 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 7,425,423 |  | $ 7,014,421 |  |  |
Unamortized loan premium, net | 336 |  | 788 |  |  |
Loans in process | (7,353) |  | (856) |  |  |
Unamortized loan fees, net | 2,740 |  | 872 |  |  |
Allowance for loan losses | (73,775) | $ (69,497) | (67,466) | $ (54,202) | $ (51,298) | $ (45,163)
Bank loans, net | $ 7,347,371 |  | $ 6,947,759 |  |  |
Gross bank loans, Percent | 100.00% |  | 100.00% |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 2,703,935 |  | $ 2,593,576 |  |  |
Allowance for loan losses | $ (9,328) | (8,779) | $ (8,430) | (5,569) | (4,190) | (2,660)
Gross bank loans, Percent | 36.40% |  | 37.00% |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 2,677,096 |  | $ 2,437,938 |  |  |
Allowance for loan losses | $ (59,572) | (56,433) | $ (54,474) | (40,805) | (38,789) | (35,127)
Gross bank loans, Percent | 36.10% |  | 34.80% |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 1,845,592 |  | $ 1,819,206 |  |  |
Allowance for loan losses | $ (1,928) | (1,894) | $ (2,088) | (3,600) | (3,393) | (3,094)
Gross bank loans, Percent | 24.90% |  | 25.90% |  |  |
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 24,392 |  | $ 24,508 |  |  |
Allowance for loan losses | $ (13) | (15) | $ (16) | (105) | (107) | (129)
Gross bank loans, Percent | 0.30% |  | 0.30% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 127,253 |  | $ 116,258 |  |  |
Allowance for loan losses | $ (1,672) | (1,320) | $ (1,520) | (932) | (1,618) | (1,363)
Gross bank loans, Percent | 1.70% |  | 1.70% |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 21,730 |  | $ 15,039 |  |  |
Allowance for loan losses | $ (229) | (164) | $ (162) | (283) | (285) | (371)
Gross bank loans, Percent | 0.30% |  | 0.20% |  |  |
Construction And Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 25,425 |  | $ 7,896 |  |  |
Allowance for loan losses | $ (303) | $ (199) | $ (100) | $ (224) | $ (437) | $ (232)
Gross bank loans, Percent | 0.30% |  | 0.10% |  |  |

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