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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,874 $ 1,870    
Interest cost $ 19 $ 19 57 57    
Benefits paid     (84) (96)    
Benefit obligation at end of period 1,847 1,831 1,847 1,831    
Funded status            
Benefit obligation at end of period (1,847) (1,831) (1,874) (1,870) $ (1,847) $ (1,831)
Unamortized loss         186 156
Accrued benefit cost at end of period         $ (1,661) $ (1,675)
Components of net periodic benefit cost            
Interest cost 19 19 57 57    
Net periodic benefit cost $ 19 $ 19 $ 57 $ 57