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Employee Benefits and Retirement Plans - Estimated Future Benefit Payments (Details)
Dec. 31, 2015
USD ($)
Compensation and Retirement Disclosure [Abstract]  
2016 $ 1,186,000
2017 1,166,000
2018 1,150,000
2019 1,134,000
2020 1,117,000
Years 2021 - 2025 $ 5,341,000