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Expected future benefit payments under SERP (Details) - Supplemental Executive Retirement Plans [Member]
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 472
2021 466
2022 458
2023 571
2024 1,220
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 5,853