Derivative Instruments (Effect Of Cash Flow 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 Ineffective Portion	$ 3,783	$ (426)	$ (10,458)
Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative Effective Portion	(204)	(4,203)	(6,003)
Interest Rate Contracts [Member] | Interest Income (Expense) [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from OCI into Income Effective Portion	646	7,112	14,446
Interest Rate Contracts [Member] | Other Non-Interest Income [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income Ineffective Portion	$ 0	$ 0	$ (14)