Offsetting of Derivative Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting Derivative Liabilities [Abstract]
Gross Amounts of Recognized Liabilities Presented in the Consolidated Balance Sheets	$ 554	$ 1,383
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(223)	(1,322)
Cash Collateral Pledged Not Offset in the Consolidated Balance Sheets	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 331	$ 61