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Post Retirement Benefits - Change in Benefit Obligation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligation:      
Interest cost $ 235,000 $ 285,000 $ 277,000
Post retirement health and life insurance benefit plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 9,160,000 8,076,000  
Interest cost 237,000 285,000  
Unrecognized loss (gain) (102,000) 1,099,000  
Benefits paid, net (186,000) (300,000)  
Benefit obligation at beginning of year 9,109,000 9,160,000 $ 8,076,000
Plan Assets 0 0  
Amounts recorded in accumulated other comprehensive income:      
Prior service credit (5,114,000) (5,610,000)  
Net loss 3,351,000 3,634,000  
Total $ (1,763,000) $ (1,976,000)  
Weighted-average assumptions:      
Discount rate used to determine benefit obligation and net periodic benefit cost 2.00% 2.90%