Derivatives and Hedging Activity (Details 3) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
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%
Derivatives in net liability position	$ 24,500,000		$ 24,500,000
Collateral posted	19,100,000		19,100,000
Termination liability value	24,500,000		24,500,000
Derivatives not designated as hedging instruments
Gain loss derivative instruments
Amount of (Loss) Gain Recognized in Income	(9,790,000)	6,158,000	(17,656,000)	22,386,000
Interest rate contracts | Derivatives not designated as hedging instruments
Gain loss derivative instruments
Amount of (Loss) Gain Recognized in Income	(2,314,000)	6,863,000	(6,511,000)	7,013,000
Foreign exchange contracts | Derivatives not designated as hedging instruments
Gain loss derivative instruments
Amount of (Loss) Gain Recognized in Income	(6,965,000)	(1,311,000)	(10,012,000)	14,767,000
Credit spread instrument | Derivatives not designated as hedging instruments
Gain loss derivative instruments
Amount of (Loss) Gain Recognized in Income	(511,000)	606,000	(1,133,000)	606,000
Cash flow hedges | Interest rate contracts | Derivatives designated as hedging instruments
Gain loss derivative instruments
(Loss) Gain Recognized in OCI (effective portion)	(457,000)	1,094,000	(708,000)	926,000
(Loss) Gain Reclassified from AOCI into Income (effective portion)	$ (364,000)	$ (407,000)	$ (737,000)	$ (854,000)