On-Balance Sheet Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments On The Consolidated Financial Statements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
On Balance Sheet Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	$ 1,558	$ 10,358
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(386)	(426)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Amount of Gain (Loss) Recognized in Income on Derivatives		1
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]
On Balance Sheet Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	1,558	10,358
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Cash Flow Hedging [Member] | Other Income (Expense) [Member] | Interest Rate Contracts [Member]
On Balance Sheet Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(386)	(426)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Not Designated As Hedging Instruments [Member]
On Balance Sheet Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		(1)
Not Designated As Hedging Instruments [Member] | Other Income (Expense) [Member] | Interest Rate Contracts [Member]
On Balance Sheet Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		$ (1)