Intangible Assets (Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition) (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Gross Carrying Amount		$ 72,037	$ 72,270
Accumulated Amortization		(52,252)	(51,253)
Net Carrying Value		19,785	21,017
Core deposit intangibles
Intangible Assets [Line Items]
Gross Carrying Amount		16,850	16,850
Accumulated Amortization		(5,199)	(4,721)
Net Carrying Value		11,651	12,129
Customer lists
Intangible Assets [Line Items]
Gross Carrying Amount		54,865	54,865
Accumulated Amortization		(47,053)	(46,302)
Net Carrying Value		7,812	8,563
Other
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	322	555
Accumulated Amortization	[1]	0	(230)
Net Carrying Value	[1]	$ 322	$ 325

[1] Balance at March 31, 2017 relates to state banking licenses and are not subject to amortization .