Intangible Assets (Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Gross Carrying Amount	$ 99,337	$ 72,270
Accumulated Amortization	(56,180)	(51,253)
Net Carrying Value	43,157	21,017
Core deposit intangibles
Intangible Assets [Line Items]
Gross Carrying Amount	16,850	16,850
Accumulated Amortization	(6,154)	(4,721)
Net Carrying Value	10,696	12,129
Customer Relationships
Intangible Assets [Line Items]
Gross Carrying Amount	76,865	54,865
Accumulated Amortization	(49,496)	(46,302)
Net Carrying Value	27,369	8,563
Other
Intangible Assets [Line Items]
Gross Carrying Amount	5,622	555
Accumulated Amortization	(530)	(230)
Net Carrying Value	5,092	325
State banking licenses
Intangible Assets [Line Items]
Net Carrying Value	$ 300	$ 300