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Benefit Plans - (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Components of net periodic benefit cost        
Service cost $ 76 $ 130 $ 228 $ 390
Interest cost 78 68 234 204
Expected return on assets (133) (144) (399) (432)
Amortization (accretion) of prior service cost and net loss (10) 24 (30) 72
Pension expense $ 11 $ 78 $ 33 $ 234