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Postretirement Benefit Plans (Net Funded Status) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in benefit obligations:      
Change in benefit obligations: Settlement loss $ 737,000    
Change in fair value of plan assets:      
Funded status at year end 345,000    
Defined Benefit Postretirement Health And Life Coverage [Member]      
Change in benefit obligations:      
Benefit obligations 508,000 $ 540,000  
Change in benefit obligations: Service cost 4,000 4,000 $ 4,000
Change in benefit obligations: Interest cost 17,000 20,000 23,000
Change in benefit obligations: Change in experience (38,000) (11,000)  
Change in benefit obligations: Change in assumptions (17,000) 20,000  
Change in benefit obligations: Change due to plan amendment 60,000    
Change in benefit obligations/fair value of plan assets: Benefit payments (59,000) (65,000)  
Benefit obligations 475,000 508,000 540,000
Change in fair value of plan assets:      
Change in fair value of plan assets: Employer contributions 59,000 65,000  
Change in benefit obligations/fair value of plan assets: Benefit payments (59,000) (65,000)  
Funded status at year end (475,000) (508,000)  
Director's Retirement Plan [Member]      
Change in benefit obligations:      
Benefit obligations 1,116,000 1,122,000  
Change in benefit obligations: Service cost 36,000 35,000 34,000
Change in benefit obligations: Interest cost 38,000 43,000 46,000
Change in benefit obligations: Actuarial gain (loss) 5,000 6,000  
Change in benefit obligations: Change in assumptions (5,000) 2,000  
Change in benefit obligations/fair value of plan assets: Benefit payments (90,000) (92,000)  
Benefit obligations 1,100,000 1,116,000 $ 1,122,000
Change in fair value of plan assets:      
Change in fair value of plan assets: Employer contributions 90,000 92,000  
Change in benefit obligations/fair value of plan assets: Benefit payments (90,000) (92,000)  
Funded status at year end (1,100,000) (1,116,000)  
Defined Benefit Pension Plan [Member]      
Change in benefit obligations:      
Benefit obligations 10,542,000    
Change in benefit obligations: Service cost 287,000    
Change in benefit obligations: Interest cost 392,000    
Change in benefit obligations: Settlement loss 118,000    
Change in benefit obligations: Actuarial gain (loss) (2,271,000)    
Change in benefit obligations/fair value of plan assets: Settlement payments (3,828,000)    
Change in benefit obligations/fair value of plan assets: Benefit payments (77,000)    
Benefit obligations 5,163,000 10,542,000  
Change in fair value of plan assets:      
Fair value of plan assets 8,121,000    
Change in fair value of plan assets: Return on plan assets 57,000    
Change in fair value of plan assets: Employer contributions 600,000    
Change in benefit obligations/fair value of plan assets: Benefit payments (77,000)    
Change in fair value of plan assets: Administrative expenses (55,000)    
Change in benefit obligations/fair value of plan assets: Settlement payments (3,828,000)    
Fair value of plan assets 4,818,000 $ 8,121,000  
Funded status at year end $ (345,000)