Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Total asset derivatives	$ 16,145	$ 16,740
Total liability derivatives	(16,794)	(17,718)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	(597)	(723)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	(597)	(723)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	16,145	16,740
Other liabilities	(16,197)	(16,995)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	14,879	16,334
Other liabilities	(14,882)	(16,337)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	1	1
Other liabilities	(1)	(1)
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	8	9
Other liabilities	(139)	(196)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	1,257	396
Other liabilities	$ (1,175)	$ (461)