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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, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 6,883,891 |  | $ 5,637,565 |  |  |
Unamortized loan premium/(discount), net | 655 |  | 858 |  |  |
Unamortized loan fees, net of loan fees | 707 |  | (49) |  |  |
Loans in process | (39,946) |  | (2,021) |  |  |
Allowance for loan losses | (62,229) | $ (54,202) | (45,163) | $ (39,145) | $ (35,866) | $ (29,787)
Bank loans, net | $ 6,783,078 |  | $ 5,591,190 |  |  |
Gross bank loans, Percent | 100.00% |  | 100.00% |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 2,517,543 |  | $ 2,161,400 |  |  |
Allowance for loan losses | $ (7,135) | (5,569) | $ (2,660) | (1,875) | (1,529) | (1,241)
Gross bank loans, Percent | 36.60% |  | 38.40% |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 2,380,417 |  | $ 1,710,399 |  |  |
Allowance for loan losses | $ (47,152) | (40,805) | $ (35,127) | (32,180) | (29,816) | (24,748)
Gross bank loans, Percent | 34.60% |  | 30.30% |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 1,839,981 |  | $ 1,614,033 |  |  |
Allowance for loan losses | $ (3,312) | (3,600) | $ (3,094) | (1,903) | (1,731) | (1,607)
Gross bank loans, Percent | 26.70% |  | 28.60% |  |  |
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 36,149 |  | $ 45,391 |  |  |
Allowance for loan losses | $ (103) | (105) | $ (129) | (295) | (107) | (105)
Gross bank loans, Percent | 0.50% |  | 0.80% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 78,614 |  | $ 78,711 |  |  |
Allowance for loan losses | $ (1,027) | (932) | $ (1,363) | (504) | (512) | (264)
Gross bank loans, Percent | 1.10% |  | 1.40% |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 13,072 |  | $ 15,008 |  |  |
Allowance for loan losses | $ (271) | (283) | $ (371) | (285) | (283) | (290)
Gross bank loans, Percent | 0.20% |  | 0.30% |  |  |
Construction And Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross bank loans | $ 18,115 |  | $ 12,623 |  |  |
Allowance for loan losses | $ (233) | $ (224) | $ (232) | $ (203) | $ (144) | $ (78)
Gross bank loans, Percent | 0.30% |  | 0.20% |  |  |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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