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Employee Benefit and Deferred Compensation Plans (Details 2)
$ in Thousands
Dec. 31, 2016
USD ($)
Pension Benefits  
Defined benefit pension plan and post-retirement health and life plan  
2017 $ 2,050
2018 2,073
2019 2,080
2020 2,080
2021 2,084
2022-2026 9,983
Other Benefits  
Defined benefit pension plan and post-retirement health and life plan  
2017 247
2018 241
2019 203
2020 184
2021 180
2022-2026 $ 616