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Employee Benefit Plans - Future benefits payable for Retirement Income Plan over next ten years (Details) - Retirement Income Plan
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 2,688
2022 2,646
2023 2,615
2024 2,614
2025 2,587
2026-2030 $ 12,112