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Intangible Assets (Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments) (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |  |
Gross goodwill | $ 145,932,000 | $ 141,943,000 | $ 145,932,000 | $ 141,943,000
Goodwill | 145,932,000 | 141,943,000 | 145,932,000 | 141,943,000
Additions | 0 | 0 |  |
Impairments | 0 | 0 |  |
Divestitures | 0 | 0 |  |
Net change in goodwill | 0 | 0 |  |
Regional Banking [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross goodwill | 47,928,000 | 43,939,000 | 47,928,000 | 43,939,000
Goodwill | 47,928,000 | 43,939,000 | 47,928,000 | 43,939,000
Additions | 0 | 0 |  |
Impairments | 0 | 0 |  |
Divestitures | 0 | 0 |  |
Net change in goodwill | 0 | 0 |  |
Fixed Income [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross goodwill | 98,004,000 | 98,004,000 | 98,004,000 | 98,004,000
Goodwill | 98,004,000 | 98,004,000 | $ 98,004,000 | $ 98,004,000
Additions | 0 | 0 |  |
Impairments | 0 | 0 |  |
Divestitures | 0 | 0 |  |
Net change in goodwill | $ 0 | $ 0 |  |

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