Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (5,821)	$ (8,310)	$ (6,653)	$ (16,315)
Foreign Exchange Contract | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	356	332	765	593
Interest Rate Lock Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(1,549)	2,774	670	7,398
Interest Rate Forward Sales Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(3,872)	(9,923)	(6,605)	(21,020)
Interest Rate Swap | Interest Rate Contracts | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (756)	$ (1,493)	$ (1,483)	$ (3,286)