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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Change in benefit obligation            
Benefit obligation at beginning of year     $ 1,581 $ 1,599    
Interest cost $ 16 $ 17 48 50    
Benefits paid     (81) (85)    
Benefit obligation at end of period 1,548 1,564 1,548 1,564    
Funded status            
Benefit obligation at end of period (1,548) (1,564) (1,548) (1,564) $ (1,548) $ (1,564)
Unamortized gain     (31) (47)    
Accrued benefit cost at end of period         $ (1,579) $ (1,611)
Components of net periodic benefit cost            
Interest cost 16 17 48 50    
Net periodic benefit cost $ 16 $ 17 $ 48 $ 50