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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,870 $ 1,967    
Interest cost $ 19 $ 21 57 63    
Benefits paid     (96) (90)    
Benefit obligation at end of period 1,831 1,940 1,831 1,940    
Funded status            
Benefit obligation at end of period (1,831) (1,940) (1,870) (1,967) $ (1,831) $ (1,940)
Unamortized loss         156 240
Accrued benefit cost at end of period         $ (1,675) $ (1,700)
Components of net periodic benefit cost            
Interest cost 19 21 57 63    
Net periodic benefit cost $ 19 $ 21 $ 57 $ 63