Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) (Not Designated As Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 4,751		$ 166		$ 4,784		$ 3,060
Other Non-Interest Income [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	(279)	[1]	47	[1]	(158)	[1]	1,172	[1]
Mortgage Revenues [Member] | Mortgage Derivatives [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 5,030	[2]	$ 119	[2]	$ 4,942	[2]	$ 1,888	[2]

[1] Gain (loss) represents net fair value adjustments (including credit related adjustments) for customer swaps and offsetting positions.

[2] Gain (loss) represents net fair value adjustments recorded for interest rate lock commitments and commitments to sell mortgage loans to third party investors.