Derivatives and Hedging Activity (Details 3) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gain loss derivative instruments
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (22,451,000)	$ (7,561,000)	$ (65,000)	$ (9,784,000)
Credit-risk-related Contingent Features
Ratio of indebtedness to total assets above which will the Company could be declared in default (as a percent)			75.00%
Collateral posted	14,600,000		14,600,000
Derivatives in liability position	32,300,000		32,300,000
Interest rate contracts | Derivatives not designated as hedging instruments
Gain loss derivative instruments
Amount of Gain/(Loss) Recognized in Income on Derivative	(4,261,000)	(51,000)	2,752,000	608,000
Foreign exchange contracts | Derivatives not designated as hedging instruments
Gain loss derivative instruments
Amount of Gain/(Loss) Recognized in Income on Derivative	(17,459,000)	(7,510,000)	(2,692,000)	(10,392,000)
Credit spread instrument | Derivatives not designated as hedging instruments
Gain loss derivative instruments
Amount of Gain/(Loss) Recognized in Income on Derivative	(731,000)		(125,000)
Cash flow hedges | Interest rate contracts
Gain loss derivative instruments
Amount of loss recognized in OCI on derivative (effective portion)		1,072,000		3,534,000
Amount of loss recognized in OCI on derivative (effective portion)	(594,000)		332,000
Amount of loss reclassified from accumulated OCI into income (effective portion)	$ 397,000	$ 661,000	$ 1,251,000	$ 1,911,000