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Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Components of Net Periodic Pension Cost |  |  |
Interest cost on projected benefit obligation | $ 3,456 | $ 3,987 | $ 3,882
Expected return on plan assets | (3,925) | (4,731) | (6,266)
Amortization of prior service credit - DNB merger | 0 | 7 | 0
Recognized net actuarial loss | 1,419 | 1,604 | 2,134
Settlement charge | 833 | 0 | 0
Net Periodic Pension Expense | 1,783 | 867 | (250)
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss) |  |  |
Net actuarial loss/(gain) | (1,282) | 2,370 | (3,271)
Recognized net actuarial loss | (1,419) | (1,604) | (2,134)
Settlement loss recognized | (833) | 0 | 0
Recognized prior service credit | 0 | 0 | 0
Total (Before Tax Effects) | (3,534) | 766 | (5,405)
Total Recognized in Net Benefit Cost and Other Comprehensive Income/(Loss) (Before Tax Effects) | $ (1,751) | $ 1,633 | $ (5,655)

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