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Bank Loans (Risk Category Of Loan Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | $ 5,923,624 | $ 5,637,565 | $ 3,505,509
Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 5,873,307 | 5,569,259 |
Special Mention [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 8,632 | 27,905 |
Substandard [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 29,707 | 40,401 |
Doubtful [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 11,978 |  |
Residential Real Estate [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 2,214,356 | 2,161,400 | 730,683
Residential Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 2,214,180 | 2,161,223 |
Residential Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 176 | 177 |
Commercial And Industrial [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 1,830,865 | 1,710,399 | 1,295,318
Commercial And Industrial [Member] | Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 1,790,574 | 1,652,211 |
Commercial And Industrial [Member] | Special Mention [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 8,632 | 27,905 |
Commercial And Industrial [Member] | Substandard [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 19,681 | 30,283 |
Commercial And Industrial [Member] | Doubtful [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 11,978 |  |
Securities-Based Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 1,728,516 | 1,614,033 | 1,345,719
Securities-Based Loans [Member] | Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 1,728,516 | 1,614,033 |
Commercial Real Estate [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 78,522 | 78,711 | 83,273
Commercial Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 69,000 | 69,189 |
Commercial Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 9,522 | 9,522 |
Consumer [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 42,856 | 45,391 | 31,036
Consumer [Member] | Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 42,851 | 45,385 |
Consumer [Member] | Substandard [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 5 | 6 |
Home Equity Lines Of Credit [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 14,578 | 15,008 | 12,511
Home Equity Lines Of Credit [Member] | Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 14,255 | 14,595 |
Home Equity Lines Of Credit [Member] | Substandard [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 323 | 413 |
Construction And Land [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | 13,931 | 12,623 | $ 6,969
Construction And Land [Member] | Pass [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total risk category of loan portfolio | $ 13,931 | $ 12,623 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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