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Employee Benefit Plans (Pension and Other Postretirement Benefits) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Components of net periodic cost:    
Interest cost $ 83 $ 112
Expected return on plan assets (205) (203)
Net amortization and deferral 280 272
Net Periodic Pension Cost $ 158 $ 181