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Employee Benefit Plans - Net Pension Cost (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 pension cost        
Service cost - benefits earned during the year $ 237 $ 373 $ 710 $ 1,118
Interest costs on projected benefit obligations 357 293 1,071 881
Expected return on plan assets (544) (570) (1,634) (1,711)
Expected administrative expenses 28 29 86 88
Amortization of unrecognized net loss (160) 0 (480) 0
Net periodic pension cost $ (82) $ 125 $ (247) $ 376