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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Number of Restricted Shares    
Nonvested balance, beginning 130,441 116,245
Granted 51,870 71,130
Vested (41,703) (48,550)
Forfeited (9,071) (8,384)
Nonvested balance, ending 131,537  
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 21.43 $ 21.13
Granted 22.61 21.67
Vested 20.91 21.51
Forfeited 22.09 $ 21.65
Nonvested balance, ending $ 22.01