Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (832)	$ (8,005)
Foreign Exchange Contract | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	409	261
Interest Rate Lock Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	2,219	4,624
Interest Rate Forward Sales Commitments | Interest Rate Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(2,733)	(11,097)
Interest Rate Swap | Interest Rate Contracts | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (727)	$ (1,793)