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Bank Loans (Risk Category Of Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | $ 7,014,421 | $ 5,637,565
Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 6,960,969 | 5,569,259
Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 22,752 | 27,905
Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 30,700 | 40,401
Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,437,938 | 1,710,399
Commercial And Industrial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,385,152 | 1,652,211
Commercial And Industrial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 22,443 | 27,905
Commercial And Industrial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 30,343 | 30,283
Securities-Based Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 1,819,206 | 1,614,033
Securities-Based Loans [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 1,819,206 | 1,614,033
Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 24,508 | 45,391
Consumer [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 24,506 | 45,385
Consumer [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2 | 6
Residential Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,593,576 | 2,161,400
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 2,593,096 | 2,161,223
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 309 |
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 171 | 177
Commercial Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 116,258 | 78,711
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 116,258 | 69,189
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio |  | 9,522
Home Equity Lines Of Credit [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 15,039 | 15,008
Home Equity Lines Of Credit [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 14,855 | 14,595
Home Equity Lines Of Credit [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 184 | 413
Construction And Land [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | 7,896 | 12,623
Construction And Land [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total risk category of loan portfolio | $ 7,896 | $ 12,623

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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=82891408&loc=d3e4428-111522 + Details
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