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Employee Benefit Plans - Schedule of benefit payments (Details) - Other Postretirement Benefit Plans, Defined Benefit
Dec. 31, 2020
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2022 $ 69,000
2023 71,000
2024 73,000
2025 75,000
2026 - 2030 $ 403,000