Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (308)	$ 1,183	$ (452)	$ 2,107
Other Non-Interest Income [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	27	55	33	(124)
Mortgage Banking Income [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (335)	$ 1,128	$ (485)	$ 2,231