Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) (Interest Rate Contracts [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (10,250)	$ (5,152)	$ (19,640)	$ (6,956)
Interest Rate Lock Commitments [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	1,680	1,844	2,216	1,936
Interest Rate Forward Sales Commitments [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(11,695)	(6,732)	(21,504)	(8,714)
Interest Rate Swap [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (235)	$ (264)	$ (352)	$ (178)