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Pension and Postretirement Benefit Plans - Benefit Payments Which Reflect Expected Future Services, Expected to Be Paid Over Next Ten Years (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
SERP I and SERP II  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 342
2022 338
2023 346
2024 354
2025 347
2026-2030 1,565
PRBP  
Defined Benefit Plan Disclosure [Line Items]  
2021 43
2022 35
2023 29
2024 24
2025 19
2026-2030 $ 46