Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) - Not Designated As Hedging Instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Total derivatives not designated as hedging instruments	$ (3,040)	$ (2,639)	$ (3,812)
Interest rate contracts | Other non-interest income
Derivative [Line Items]
Total derivatives not designated as hedging instruments	(29)	20	76
Mortgage derivatives | Mortgage banking income | Interest Rate Lock Commitments
Derivative [Line Items]
Total derivatives not designated as hedging instruments	8	(634)	182
Mortgage derivatives | Mortgage banking income | Forward commitments to sell fixed-rate mortgage loans
Derivative [Line Items]
Total derivatives not designated as hedging instruments	(691)	(2,025)	1,725
Visa Derivative | Other non-interest expense
Derivative [Line Items]
Total derivatives not designated as hedging instruments	$ (2,328)	$ 0	$ (5,795)