Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 166		$ (459)		$ 3,060		$ 893
Other Non-Interest Income [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0		0		0		0
Other Non-Interest Income [Member] | Interest Rate Contracts [Member] | Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	47	[1]	(398)	[1]	1,172	[1]	(379)	[1]
Mortgage Revenues [Member] | Mortgage Derivatives [Member] | Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 119	[2]	$ (61)	[2]	$ 1,888	[2]	$ 1,272	[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.