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Employee Benefit Plans (Obligation and Funded Status of Pension and Postretirement Plans) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year $ 4,362,000 $ 5,832,000  
Service cost 0 0 $ 0
Interest cost 116,000 130,000 155,000
Actuarial (gains) losses 44,000 (282,000)  
Participant contributions 0 0  
Retiree drug subsidy received 0 0  
Benefits paid (1,434,000) (1,318,000)  
Benefit obligation at end of year 3,088,000 4,362,000 5,832,000
Change in plan assets      
Fair value of plan assets at beginning of year 0 0  
Actual gains on plan assets 0 0  
Company contributions 1,434,000 1,318,000  
Participant contributions 0 0  
Benefits paid (1,434,000) (1,318,000)  
Fair value of plan assets at end of year 0 0 0
Under funded status of plans at end of year (3,088,000) (4,362,000)  
Postretirement Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year 20,638,000 22,602,000  
Service cost 365,000 319,000 391,000
Interest cost 854,000 752,000 985,000
Actuarial (gains) losses 4,687,000 (1,623,000)  
Participant contributions 297,000 145,000  
Retiree drug subsidy received 0 125,000  
Benefits paid (1,969,000) (1,682,000)  
Benefit obligation at end of year 24,872,000 20,638,000 22,602,000
Change in plan assets      
Fair value of plan assets at beginning of year 0 0  
Actual gains on plan assets 0 0  
Company contributions 1,672,000 1,537,000  
Participant contributions 297,000 145,000  
Benefits paid (1,969,000) (1,682,000)  
Fair value of plan assets at end of year 0 0 $ 0
Under funded status of plans at end of year $ (24,872,000) $ (20,638,000)