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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Restricted Shares      
Nonvested balance, beginning 130,441 116,245 135,471
Granted 66,498 71,130 60,415
Vested (46,034) (48,550) (56,090)
Forfeited (19,284) (8,384) (23,551)
Nonvested balance, ending 131,621 130,441 116,245
Weighted Average Grant-Date Fair Value      
Nonvested balance, beginning $ 21.43 $ 21.13 $ 20.13
Granted 20.57 21.67 22.74
Vested 21.01 21.51 18.71
Forfeited 22.25 21.65 20.90
Nonvested balance, ending $ 21.02 $ 21.43 $ 21.13