Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (2,816)	$ (23,805)	$ 14,298
Interest Rate Contracts [Member] | Interest Rate Lock Commitments [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	763	2,000	(772)
Interest Rate Contracts [Member] | Interest Rate Forward Sales Commitments [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(4,752)	(23,463)	13,225
Interest Rate Contracts [Member] | Interest Rate Swap [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	162	(3,232)	1,243
Foreign Exchange Contract [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ 1,011	$ 890	$ 602