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Stock Incentive Plans (Changes in the Stock Options Outstanding) (Details) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Options    
Outstanding, at the beginning 86,594  
Issued 12,420 65,887
Exercised (5,976)  
Expired (12,255)  
Outstanding, at the end 80,783 86,594
Options Exercisable 14,550  
Weighted Average Exercise Price    
Outstanding, at the beginning $ 36.21  
Issued 37.21  
Exercised (17.04)  
Expired (16.56)  
Outstanding, at the end 40.76 $ 36.21
Exercisable $ 39.52  
Aggregate Intrinsic Value    
Outstanding, Aggregate Intrinsic Value $ 51  
Exercisable $ 33