Derivative Instruments and Hedging Activities (Details) - Other Derivative Instruments - Other Derivative Instruments - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Gross notional amount outstanding		$ 1,656,612	$ 853,385
Derivative asset fair value		13,478	11,446
Derivative liability fair value		(13,478)	(11,446)
Fair value of derivative	[1]	$ 13,753	$ 11,939

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