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Postretirement Benefit Plans (Net Funded Status) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligations:      
Change in benefit obligations: Settlement (gain) loss $ 34,000 $ 737,000  
Change in fair value of plan assets:      
Funded status at year end 183,000 345,000  
Defined Benefit Postretirement Health And Life Coverage [Member]      
Change in benefit obligations:      
Benefit obligations 475,000 508,000  
Change in benefit obligations: Service cost 3,000 4,000 $ 4,000
Change in benefit obligations: Interest cost 17,000 17,000 20,000
Change in benefit obligations: Change in experience (13,000) (38,000)  
Change in benefit obligations: Change in assumptions 34,000 (17,000)  
Change in benefit obligations: Change due to plan amendment   60,000  
Change in benefit obligations/fair value of plan assets: Benefit payments (112,000) (59,000)  
Benefit obligations 404,000 475,000 508,000
Change in fair value of plan assets:      
Change in fair value of plan assets: Employer contributions 112,000 59,000  
Change in benefit obligations/fair value of plan assets: Benefit payments (112,000) (59,000)  
Funded status at year end (404,000) (475,000)  
Director's Retirement Plan [Member]      
Change in benefit obligations:      
Benefit obligations 1,100,000 1,116,000  
Change in benefit obligations: Service cost 51,000 36,000 35,000
Change in benefit obligations: Interest cost 42,000 38,000 43,000
Change in benefit obligations: Actuarial gain (loss) (17,000) 5,000  
Change in benefit obligations: Change in assumptions (12,000) (5,000)  
Change in benefit obligations/fair value of plan assets: Benefit payments (87,000) (90,000)  
Benefit obligations 1,077,000 1,100,000 1,116,000
Change in fair value of plan assets:      
Change in fair value of plan assets: Employer contributions 87,000 90,000  
Change in benefit obligations/fair value of plan assets: Benefit payments (87,000) (90,000)  
Funded status at year end (1,077,000) (1,100,000)  
Defined Benefit Pension Plan [Member]      
Change in benefit obligations:      
Benefit obligations 5,163,000 10,542,000  
Change in benefit obligations: Service cost 92,000 287,000  
Change in benefit obligations: Interest cost 217,000 392,000  
Change in benefit obligations: Settlement (gain) loss (91,000) 118,000  
Change in benefit obligations: Actuarial gain (loss) 655,000 (2,271,000)  
Change in benefit obligations/fair value of plan assets: Settlement payments (363,000) (3,828,000)  
Change in benefit obligations/fair value of plan assets: Benefit payments (86,000) (77,000)  
Benefit obligations 5,587,000 5,163,000 10,542,000
Change in fair value of plan assets:      
Fair value of plan assets 4,818,000 8,121,000  
Change in fair value of plan assets: Return on plan assets 498,000 57,000  
Change in fair value of plan assets: Employer contributions 600,000 600,000  
Change in benefit obligations/fair value of plan assets: Benefit payments (86,000) (77,000)  
Change in fair value of plan assets: Administrative expenses (63,000) (55,000)  
Change in benefit obligations/fair value of plan assets: Settlement payments (363,000) (3,828,000)  
Fair value of plan assets 5,404,000 4,818,000 $ 8,121,000
Funded status at year end $ (183,000) $ (345,000)