Derivative Instruments and Hedging Activities (Details) - Other Derivative Instruments - Other Derivative Instruments - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Gross notional amount outstanding		$ 2,252,704	$ 1,656,612
Derivative asset fair value		17,370	13,478
Derivative liability fair value		(15,347)	(13,478)
Fair value of derivative	[1]	$ 15,605	$ 13,753

[1] This amount represents the fair value if credit risk related contingent features were triggered.