Intangible Assets (Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 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