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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,599 $ 1,874    
Interest cost $ 17 $ 19 33 38    
Benefits paid     (56) (56)    
Benefit obligation at end of period 1,576 1,856 1,576 1,856    
Funded status            
Benefit obligation at end of period (1,576) (1,856) (1,599) (1,874) $ (1,576) $ (1,856)
Unamortized (gain) loss         (47) 186
Accrued benefit cost at end of period         $ (1,623) $ (1,670)
Components of net periodic benefit cost            
Interest cost 17 19 33 38    
Net periodic benefit cost $ 17 $ 19 $ 33 $ 38