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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Change in benefit obligation        
Benefit obligation at beginning of year     $ 1,353 $ 1,523
Interest cost $ 9 $ 8 17 15
Benefits paid     (44) (49)
Benefit obligation at end of period 1,326 1,489 1,326 1,489
Funded status        
Benefit obligation at end of period (1,326) (1,489) (1,326) (1,489)
Unamortized gain     (133) (35)
Accrued benefit cost at end of period (1,459) (1,524) (1,459) (1,524)
Components of net periodic benefit cost        
Interest cost 9 8 17 15
Net periodic benefit cost $ 9 $ 8 $ 17 $ 15