Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) (Interest Rate Contracts [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ 5,114	$ (1,282)
Interest Rate Lock Commitments [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	2,467	(298)
Interest Rate Forward Sales Commitments [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	2,631	(1,568)
Interest Rate Swap [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ 16	$ 584