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Employee Benefits and Retirement Plans - Estimated Future Benefit Payments (Details)
Dec. 31, 2018
USD ($)
Retirement Benefits [Abstract]  
2019 $ 1,159,000
2020 1,127,000
2021 1,097,000
2022 1,113,000
2023 1,075,000
Years 2024 - 2028 $ 4,744,000