Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative instruments	$ 20,445	$ 21,537
Total liability derivatives	(21,515)	(22,722)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	(908)	(1,053)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other liabilities	(908)	(1,053)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets	20,445	21,537
Other liabilities	(20,607)	(21,669)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Other assets	18,569	19,051
Other liabilities	(18,735)	(19,157)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Other assets	2	11
Other liabilities	(2)	(11)
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivatives, Fair Value [Line Items]
Other assets	10	9
Other liabilities	(109)	(141)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	1,864	2,440
Other liabilities	(1,761)	(2,343)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	20
Other liabilities	0	0
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivatives, Fair Value [Line Items]
Other assets	0	6
Other liabilities	$ 0	$ (17)