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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, 2022
Mar. 31, 2021
Change in benefit obligation    
Benefit obligation at beginning of year $ 1,353 $ 1,523
Interest cost 8 7
Benefits paid (22) (24)
Benefit obligation at end of period 1,339 1,506
Funded status    
Benefit obligation at end of period (1,339) (1,506)
Unamortized gain (133) (35)
Accrued benefit cost at end of period (1,472) (1,541)
Components of net periodic benefit cost    
Interest cost 8 7
Net periodic benefit cost $ 8 $ 7