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Employee Benefit Plans - Net Pension Cost (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Components of net pension cost    
Service cost - benefits earned during the year $ 1,692 $ 1,614
Interest costs on projected benefit obligations 1,072 1,127
Expected return on plan assets (1,843) (1,598)
Expected administrative expenses 104 110
Amortization of prior service cost   50
Amortization of unrecognized net loss 367 164
Net periodic pension cost $ 1,392 $ 1,467