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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,599 $ 1,874    
Interest cost $ 17 $ 19 50 57    
Benefits paid     (85) (84)    
Benefit obligation at end of period 1,564 1,847 1,564 1,847    
Funded status            
Benefit obligation at end of period (1,564) (1,847) (1,599) (1,874) $ (1,564) $ (1,847)
Unamortized (gain) loss         (47) 186
Accrued benefit cost at end of period         $ (1,611) $ (1,661)
Components of net periodic benefit cost            
Interest cost 17 19 50 57    
Net periodic benefit cost $ 17 $ 19 $ 50 $ 57