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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, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Change in benefit obligation        
Benefit obligation at beginning of year $ 1,523 $ 1,581    
Interest cost 7 16    
Benefits paid (24) (27)    
Benefit obligation at end of period 1,506 1,570    
Funded status        
Benefit obligation at end of period (1,506) (1,570) $ (1,506) $ (1,570)
Unamortized gain (35) (31)    
Accrued benefit cost at end of period     $ (1,541) $ (1,601)
Components of net periodic benefit cost        
Interest cost 7 16    
Net periodic benefit cost $ 7 $ 16