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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,874 $ 1,870    
Interest cost $ 19 $ 19 38 38    
Benefits paid     (56) (64)    
Benefit obligation at end of period 1,856 1,844 1,856 1,844    
Funded status            
Benefit obligation at end of period (1,856) (1,844) (1,874) (1,870) $ (1,856) $ (1,844)
Unamortized loss         186 102
Accrued benefit cost at end of period         $ (1,670) $ (1,742)
Components of net periodic benefit cost            
Interest cost 19 19 38 38    
Net periodic benefit cost $ 19 $ 19 $ 38 $ 38