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Stock Based Compensation (Summary of Restricted Stock Activity) (Details) - Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock Non-vested, beginning balance 34,615 30,415
Restricted stock, granted 13,100 13,100
Restricted stock, vested (11,520) (8,900)
Restricted stock, forfeited 0
Restricted stock Non-vested, ending balance 36,195 34,615
Restricted stock Non-vested, weighted-average grant date fair value, beginning balance $ 27.82 $ 24.46
Restricted stock, granted, weighted-average grant date fair value 36.02 32.34
Restricted stock, vested, weighted-average grant date fair value 25.12 23.00
Restricted stock, forfeited, weighted-average grant date fair value
Restricted stock Non-vested, weighted-average grant date fair value, ending balance $ 31.65 $ 27.82