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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Change in benefit obligation        
Benefit obligation at beginning of year     $ 1,050 $ 1,353
Interest cost $ 4 $ 7 14 24
Benefits paid     (66) (66)
Benefit obligation at end of period 998 1,311 998 1,311
Funded status        
Benefit obligation at end of period (998) (1,311) (998) (1,311)
Unamortized gain     (345) (133)
Accrued benefit cost at end of period (1,343) (1,444) (1,343) (1,444)
Components of net periodic benefit cost        
Interest cost 4 7 14 24
Net periodic benefit cost $ 4 $ 7 $ 14 $ 24