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, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Total derivatives not designated as hedging instruments	$ (3,043)	$ (3,040)	$ (2,639)
Interest rate contracts | Capital markets income
Derivative [Line Items]
Total derivatives not designated as hedging instruments	(338)	(29)	20
Mortgage derivatives | Mortgage banking income | Interest Rate Lock Commitments
Derivative [Line Items]
Total derivatives not designated as hedging instruments	346	8	(634)
Mortgage derivatives | Mortgage banking income | Forward commitments to sell fixed-rate mortgage loans
Derivative [Line Items]
Total derivatives not designated as hedging instruments	651	(691)	(2,025)
Visa derivative | Other non-interest expense
Derivative [Line Items]
Total derivatives not designated as hedging instruments	(3,611)	(2,328)	0
Other contracts | Capital markets income
Derivative [Line Items]
Total derivatives not designated as hedging instruments	$ (91)	$ 0	$ 0