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New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Other operating expenses | $ 72,452 | $ 63,013
ASU 2018-02 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Reclassification adjustment related to cash flow hedges and investment portfolio credit risk | 3,000 |
ASU 2016-18 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Decrease in net cash provided by operating activities |  | $ 73,000
ASU 2014-09 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Cumulative effect on retained earnings | 3,900 |
Capital raising and advisory fee revenues | 8,600 |
Other operating expenses | $ 8,600 |

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 + Details
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