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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, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 8,344,626 |  | $ 7,014,421 |  |  |
Unamortized loan premium/(discount), net | (13,419) |  | 788 |  |  |
Loans in process | (2,755) |  | (856) |  |  |
Unamortized loan fees, net | 6,237 |  | 872 |  |  |
Allowance for loan losses | (80,700) | $ (73,775) | (67,466) | $ (62,229) | $ (54,202) | $ (45,163)
Bank loans, net | $ 8,253,989 |  | $ 6,947,759 |  |  |
Gross bank loans, Percent | 100.00% |  | 100.00% |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 3,127,435 |  | $ 2,437,938 |  |  |
Allowance for loan losses | $ (64,580) | (59,572) | $ (54,474) | (47,152) | (40,805) | (35,127)
Gross bank loans, Percent | 37.50% |  | 34.80% |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 2,792,269 |  | $ 2,593,576 |  |  |
Allowance for loan losses | $ (10,493) | (9,328) | $ (8,430) | (7,135) | (5,569) | (2,660)
Gross bank loans, Percent | 33.50% |  | 37.00% |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 1,836,450 |  | $ 1,819,206 |  |  |
Allowance for loan losses | $ (1,923) | (1,928) | $ (2,088) | (3,312) | (3,600) | (3,094)
Gross bank loans, Percent | 22.00% |  | 25.90% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 328,814 |  | $ 116,258 |  |  |
Allowance for loan losses | $ (1,762) | (1,672) | $ (1,520) | (1,027) | (932) | (1,363)
Gross bank loans, Percent | 3.90% |  | 1.70% |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 29,118 |  | $ 15,039 |  |  |
Allowance for loan losses | $ (229) | (229) | $ (162) | (271) | (283) | (371)
Gross bank loans, Percent | 0.30% |  | 0.20% |  |  |
Construction And Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 120,969 |  | $ 7,896 |  |  |
Allowance for loan losses | $ (903) | (303) | $ (100) | (233) | (224) | (232)
Gross bank loans, Percent | 1.40% |  | 0.10% |  |  |
Other [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 109,571 |  | $ 24,508 |  |  |
Allowance for loan losses | $ (11) | $ (13) | $ (16) | $ (103) | $ (105) | $ (129)
Gross bank loans, Percent | 1.40% |  | 0.30% |  |  |

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