Derivative Instruments (Schedule of Fair Values of Derivative Instruments) (Details) (USD $) In Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010	Dec. 31, 2010
Derivative instruments	$ 18,495	[1]		$ 18,495	[1]		$ 18,823	[1]
Total liability derivatives	(19,687)	[1]		(19,687)	[1]		(19,584)	[1]
Interest Rate Swaps [Member] | Derivatives Designated As Hedging Instruments [Member]
Other liabilities	(1,090)			(1,090)			(1,159)
Interest Rate Swaps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	17,121			17,121			17,712
Other liabilities	(17,220)			(17,220)			(17,799)
Interest Rate Caps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	45			45			84
Other liabilities	(45)			(45)			(84)
Credit Risk Participation Agreements [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	6			6
Other liabilities	(373)			(373)			(130)
Foreign Exchange (Forward Contracts) [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	1,190			1,190			492
Other liabilities	(905)			(905)			(359)
Foreign Exchange (Option Contracts) [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	1			1
Other liabilities	(1)			(1)
Mortgage Loan Commitments [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	102			102			101
Other liabilities	(2)			(2)			(30)
Mortgage Loan Forward Sale Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Other assets	30			30			434
Other liabilities	(51)			(51)			(23)
Derivatives Designated As Hedging Instruments [Member]
Other liabilities	(1,090)			(1,090)			(1,159)
Derivatives Not Designated As Hedging Instruments [Member]
Other assets	18,495			18,495			18,823
Other liabilities	(18,597)			(18,597)			(18,425)
Total derivatives not designated as hedging instruments	$ 151		$ 344	$ 341		$ 797

[1] The fair value of each class of derivative is shown in Note 10.