Derivatives and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$ 53,839		$ 63,231		$ 70,270
Derivative Liability, Fair Value	65,506		77,968		87,161
Interest rate swaps | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0		0		0
Derivative Asset, Fair Value	0	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	133,159		161,133		182,950
Derivative Liability, Fair Value	$ 13,289	[2]	$ 19,080	[2]	$ 22,071	[2]

[1] (a) Included in Other Assets on the Consolidated Balance Sheet

[2] (b) Included in Other Liabilities on the Consolidated Balance Sheet