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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Number of Restricted Shares    
Nonvested balance, beginning 116,245 135,471
Granted 7,135 60,415
Vested (4,043) (56,090)
Forfeited (7,619) (23,551)
Nonvested balance, ending 111,718 116,245
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 21.13 $ 20.13
Granted 24.09 22.74
Vested 23.97 18.71
Forfeited 21.57 20.90
Nonvested balance, ending $ 20.55 $ 21.13