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Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components of Net Periodic Pension Cost        
Interest cost on projected benefit obligation $ 797 $ 890 $ 1,500 $ 1,781
Expected return on plan assets (645) (971) (1,361) (1,943)
Net amortization 298 385 546 769
Settlement Charge 177 0 926 0
Net Periodic Pension Expense $ 627 $ 304 $ 1,611 $ 607