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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
Mar. 31, 2019
Mar. 31, 2018
Components of Net Periodic Pension Cost    
Interest cost on projected benefit obligation $ 989 $ 967
Expected return on plan assets (1,180) (1,567)
Net amortization 394 544
Net Periodic Pension Expense $ 203 $ (56)