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Expected future benefit payments under SERP (Details) - Supplemental Executive Retirement Plans [Member]
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 472
2022 464
2023 576
2024 1,224
2025 1,214
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 5,921