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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Derivative Asset Positions    
Gross position - asset / (liability) $ 181 $ 316
Netting adjustment (35) (106)
Net position - asset / (liability) 146 210
Derivative Liability Positions    
Gross position - asset / (liability) (35) (106)
Netting adjustment 35 106
Net position - asset / (liability) $ 0 $ 0