Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (4,067)	$ (5,827)	$ (10,720)	$ (22,142)
Foreign Exchange Contract | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	387	307	1,152	900
Interest Rate Lock Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	36	(451)	706	6,947
Interest Rate Forward Sales Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(4,337)	(5,865)	(10,942)	(26,885)
Interest Rate Swap | Interest Rate Contracts | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (153)	$ 182	$ (1,636)	$ (3,104)