On-Balance Sheet Derivative Instruments And Hedging Activities (Schedule Of Derivative Insturments On The Consolidated Financial Statements) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (1,911)	$ 9,370
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1,722)	(1,646)
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	(2)	3	198
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(1,911)	9,370
Cash Flow Hedging [Member] | Interest Income (Expense) [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1,722)	(1,646)
Cash Flow Hedging [Member] | Other Income (Expense) [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(2)	3
Derivatives Not Designated As Hedging Instruments [Member] | Other Income (Expense) [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (2)	$ 3