Derivative Instruments (Effect Of Fair Value Hedges On Consolidated Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 3,783		$ (426)		$ (10,458)
Amount of Gain (Loss) Recognized in Income on Hedged Item	0		0		972
Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0		0		(991)
Amount of Gain (Loss) Recognized in Income on Hedged Item	0		0		972
Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	3,783		(426)		(9,467)
Other Non-Interest Income [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0		0		(14)
Other Non-Interest Income [Member] | Interest Rate Contracts [Member] | Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0	[1]	0	[1]	(991)	[1]
Amount of Gain (Loss) Recognized in Income on Hedged Item	0	[1]	0	[1]	972	[1]
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	1,419	[2]	(819)	[2]	(6,902)	[2]
Mortgage Revenues [Member] | Mortgage Derivatives [Member] | Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 2,364	[3]	$ 393	[3]	$ (2,565)	[3]

[1] Gain (loss) represents fair value adjustments recorded for fair value hedges designated in hedging relationships and related hedged items

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

[3] Gain (loss) represents net fair value adjustments recorded for interest rate lock commitments and commitments to sell mortgage loans