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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
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Change in benefit obligation        
Benefit obligation at beginning of year $ 1,581 $ 1,599    
Interest cost 16 17    
Benefits paid (27) (28)    
Benefit obligation at end of period 1,570 1,588    
Funded status        
Benefit obligation at end of period (1,570) (1,588) $ (1,570) $ (1,588)
Unamortized gain     (31) (47)
Accrued benefit cost at end of period     $ (1,601) $ (1,635)
Components of net periodic benefit cost        
Interest cost 16 17    
Net periodic benefit cost $ 16 $ 17