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Employee Benefit Plans - Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,870 $ 1,967    
Interest cost $ 19 $ 21 38 42    
Benefits paid     (64) (60)    
Benefit obligation at end of period 1,844 1,949 1,844 1,949    
Funded status            
Benefit obligation at end of period (1,844) (1,949) (1,870) (1,967) $ (1,844) $ (1,949)
Unamortized loss         102 240
Accrued benefit cost at end of period         $ (1,742) $ (1,709)
Components of net periodic benefit cost            
Interest cost 19 21 38 42    
Net periodic benefit cost $ 19 $ 21 $ 38 $ 42