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Stock-Based Compensation (Schedule of Restricted Stock Outstanding) (Details) - Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares      
Units outstanding and unearned at January 1 115,780 96,540 73,880
RSUs granted 58,700 66,000 57,100
RSUs vested (66,100) (46,760) (34,440)
Units outstanding and unearned at December 31 108,380 115,780 96,540
Weighted Average Grant Date Fair Value      
Units outstanding and unearned at January 1 $ 15.27 $ 16.47 $ 16.87
RSUs granted 18.76 14.27 15.81
RSUs vested 15.77 16.33 16.24
Units outstanding and unearned at December 31 $ 16.86 $ 15.27 $ 16.47