Derivative Instruments (Schedule Of Fair Values Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Derivative instruments	$ 21,537	[1]	$ 18,823	[1]
Total liability derivatives	(22,722)	[1]	(19,584)	[1]
Derivatives Designated As Hedging Instruments [Member]
Other liabilities	(1,053)		(1,159)
Derivatives Not Designated As Hedging Instruments [Member]
Other assets	21,537		18,823
Other liabilities	(21,669)		(18,425)
Interest Rate Swaps [Member] | Derivatives Designated As Hedging Instruments [Member]
Other liabilities	(1,053)		(1,159)
Interest Rate Swaps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	19,051		17,712
Other liabilities	(19,157)		(17,799)
Interest Rate Caps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	11		84
Other liabilities	(11)		(84)
Credit Risk Participation Agreements [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	9
Other liabilities	(141)		(130)
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	2,440		492
Other liabilities	(2,343)		(359)
Mortgage Loan Commitments [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	20		101
Other liabilities			(30)
Mortgage Loan Forward Sale Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	6		434
Other liabilities	$ (17)		$ (23)

[1] The fair value of each class of derivative is shown in Note 17.