Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives not Designated as Hedging Instruments
Gross amounts recognized	$ 8,590	$ 11,295
Gross amounts offset	(1,630)	0
Net amounts presented in the Consolidated Balance Sheets	6,960	11,295
Net Amount	6,960	11,295
Gross amounts recognized	8,588	11,276
Gross amounts offset	(1,630)	0
Net amounts presented in the Consolidated Balance Sheets	6,958	11,276
Collateral Already Posted, Aggregate Fair Value	(14,340)	(12,573)
Net Amount	$ (7,382)	$ (1,297)