Derivatives and Hedging Activity (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	$ 9,513	$ 9,227
Derivative in a Liability Position, Fair Value	32,252	27,770
Derivatives designated as cash flow hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	96
Derivative in a Liability Position, Fair Value	1,084	2,571
Derivatives not designated as hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	9,417	9,227
Derivative in a Liability Position, Fair Value	31,168	25,199
Interest rate contracts | Derivatives designated as cash flow hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	96
Derivative in a Liability Position, Fair Value	1,084	2,571
Interest rate contracts | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	3,243	4,892
Derivative in a Liability Position, Fair Value	6,186	1,772
Foreign exchange contracts | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	3,243	4,335
Derivative in a Liability Position, Fair Value	24,982	23,427
Credit spread instrument | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	$ 2,931