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Employee Benefits and Retirement Plans - Estimated Future Benefit Payments (Details)
Dec. 31, 2016
USD ($)
Compensation and Retirement Disclosure [Abstract]  
2017 $ 1,186,000
2018 1,163,000
2019 1,137,000
2020 1,108,000
2021 1,081,000
Years 2022 - 2026 $ 5,157,000