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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | $ 17,662,000 |  | $ 19,961,000 |
Current Balance | 7,407,761,000 |  | 6,994,460,000 |
Recorded Investment in Loans, Total | 7,425,423,000 |  | 7,014,421,000 |
Non-Accrual | 14,977,000 | [1] | 20,090,000 | [2]
Restructured | 9,107,000 | [1] | 9,123,000 | [2]
Total | 24,084,000 | [1] | 29,213,000 | [2]
Loans past due 90 days and still accruing interest | 0 |  | 0 |
30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 3,143,000 |  | 19,961,000 |
90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 14,519,000 |  |  |
Residential Real Estate [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 2,811,000 |  | 7,892,000 |
Current Balance | 2,701,124,000 |  | 2,585,684,000 |
Recorded Investment in Loans, Total | 2,703,935,000 |  | 2,593,576,000 |
Restructured | 170,000 | [1] | 171,000 | [2]
Total | 170,000 | [1] | 171,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 2,811,000 |  | 7,892,000 |
Commercial And Industrial [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 14,510,000 |  | 11,883,000 |
Current Balance | 2,662,586,000 |  | 2,426,055,000 |
Recorded Investment in Loans, Total | 2,677,096,000 |  | 2,437,938,000 |
Non-Accrual | 14,783,000 | [1] | 19,904,000 | [2]
Restructured | 8,937,000 | [1] | 8,952,000 | [2]
Total | 23,720,000 | [1] | 28,856,000 | [2]
Commercial And Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 11,883,000 |
Commercial And Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 14,510,000 |  |  |
Securities-Based Loans [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Current Balance | 1,845,592,000 |  | 1,819,206,000 |
Recorded Investment in Loans, Total | 1,845,592,000 |  | 1,819,206,000 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Current Balance | 127,253,000 |  | 116,258,000 |
Recorded Investment in Loans, Total | 127,253,000 |  | 116,258,000 |
Consumer [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 2,000 |
Current Balance | 24,392,000 |  | 24,506,000 |
Recorded Investment in Loans, Total | 24,392,000 |  | 24,508,000 |
Non-Accrual | 1,000 | [1] | 2,000 | [2]
Total | 1,000 | [1] | 2,000 | [2]
Consumer [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 2,000 |
Home Equity Lines Of Credit [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 341,000 |  | 184,000 |
Current Balance | 21,389,000 |  | 14,855,000 |
Recorded Investment in Loans, Total | 21,730,000 |  | 15,039,000 |
Non-Accrual | 193,000 | [1] | 184,000 | [2]
Total | 193,000 | [1] | 184,000 | [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 332,000 |  | 184,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total Past Due | 9,000 |  |  |
Construction And Land [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Current Balance | 25,425,000 |  | 7,896,000 |
Recorded Investment in Loans, Total | $ 25,425,000 |  | $ 7,896,000 |
[1] | There were no loans past due 90 days and still accruing interest at June 30, 2018.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2017.

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