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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of Net Periodic Pension Cost        
Interest cost on projected benefit obligation $ 989 $ 967 $ 1,978 $ 1,934
Expected return on plan assets (1,181) (1,567) (2,361) (3,134)
Net amortization 395 545 789 1,089
Net Periodic Pension Expense $ 203 $ (55) $ 406 $ (111)