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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative asset positions, gross position - asset $ 551 $ 316
Derivative asset positions, netting adjustment (22) (106)
Derivative asset positions, net position - asset 529 210
Derivative liability positions, gross position - liability (22) (106)
Derivative liability positions, netting adjustment 22 106
Derivative liability positions, net position - liability $ 0 $ 0