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Employee Benefit Plans - Net Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Components of net pension cost        
Service cost - benefits earned during the year $ 338 $ 430 $ 745 $ 846
Interest costs on projected benefit obligations 291 280 587 536
Expected return on plan assets (583) (465) (1,141) (922)
Expected administrative expenses 29 26 59 52
Amortization of prior service cost 0 0 0 0
Amortization of unrecognized net loss 0 138 0 184
Net periodic pension cost $ 75 $ 409 $ 250 $ 696