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Benefit Plans, Net Pension Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net Pension Costs [Abstract]      
Amortization from accumulated other comprehensive loss in 2021 $ 260    
SERP [Member]      
Net Pension Costs [Abstract]      
Interest cost on projected benefit obligation 266 $ 315 $ 290
Amortization of actuarial loss 159 46 136
Net pension costs $ 425 $ 361 $ 426