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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Number of Restricted Shares    
Nonvested balance, beginning 116,245 135,471
Granted 2,550 60,415
Vested (2,163) (56,090)
Forfeited 0 (23,551)
Nonvested balance, ending 116,632 116,245
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 21.13 $ 20.13
Granted 25.52 22.74
Vested 23.91 18.71
Forfeited 0.00 20.90
Nonvested balance, ending $ 21.17 $ 21.13