Derivatives and Hedging Activity - Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	$ 36,938	$ 45,091
Fair Value of Derivatives in a Liability Position	16,202	5,196
Derivatives designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	5	57
Fair Value of Derivatives in a Liability Position	343	122
Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	36,933	45,034
Fair Value of Derivatives in a Liability Position	15,859	5,074
Interest rate swaps | Derivatives designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	5	57
Fair Value of Derivatives in a Liability Position	343	122
Interest rate swaps | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	1,303	2,360
Fair Value of Derivatives in a Liability Position	12,458	4,970
Foreign exchange contracts | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	33,000	41,137
Fair Value of Derivatives in a Liability Position	3,401	104
Credit index instruments | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	$ 2,630	$ 1,537