Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative instruments	$ 18,785	$ 21,537
Total liability derivatives	(20,076)	(22,722)
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other liabilities	(965)	(1,053)
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other assets	18,785	21,537
Other liabilities	(19,111)	(21,669)
Interest Rate Swaps [Member] | Derivatives In Fair Value Hedging Relationships [Member]
Derivatives, Fair Value [Line Items]
Other assets
Other liabilities	(965)	(1,053)
Interest Rate Swaps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other assets	17,701	19,051
Other liabilities	(17,877)	(19,157)
Interest Rate Caps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other assets	6	11
Other liabilities	(6)	(11)
Credit Risk Participation Agreements [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other assets	9	9
Other liabilities	(115)	(141)
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other assets	1,069	2,440
Other liabilities	(1,113)	(2,343)
Mortgage Loan Commitments [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other assets		20
Mortgage Loan Forward Sale Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Other assets		6
Other liabilities		$ (17)