Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ 2,178	$ (5,821)	$ 13,010	$ (6,653)
Foreign Exchange Contract | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	480	356	815	765
Interest Rate Lock Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	908	(1,549)	2,030	670
Interest Rate Forward Sales Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	500	(3,872)	8,744	(6,605)
Interest Rate Swap | Interest Rate Contracts | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ 290	$ (756)	$ 1,421	$ (1,483)