Derivatives and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$ 65,418		$ 62,056		$ 47,809
Derivative Liability, Fair Value	84,602		86,106		72,037
Interest rate swaps [Member] | Designated as Hedging Instrument [Member]
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0		819		0
Derivative Asset, Fair Value	0	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	196,798		234,330		267,792
Derivative Liability, Fair Value	$ 23,229	[2]	$ 25,889	[2]	$ 25,772	[2]

[1] Included in Other Assets on the Consolidated Balance Sheets

[2] Included in Other Liabilities on the Consolidated Balance Sheets