Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (289)	$ (308)	$ (2,074)	$ (452)
Interest rate contracts | Other non-interest income
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0	27	(1)	33
Mortgage derivatives | Mortgage banking income
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (289)	$ (335)	$ (2,073)	$ (485)