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Employee Benefit Plans - Net Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of net pension cost      
Service cost - benefits earned during the year $ 1,614 $ 1,430 $ 1,707
Interest costs on projected benefit obligations 1,127 1,169 1,037
Expected return on plan assets (1,598) (1,467) (1,327)
Expected administrative expenses 110 122 93
Amortization of prior service cost 50 79 79
Amortization of unrecognized net loss 164 0 140
Net periodic pension cost $ 1,467 $ 1,333 $ 1,729