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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Restricted Shares      
Nonvested balance, beginning 135,471 154,998 169,418
Granted 60,415 53,790 64,522
Vested (56,090) (64,874) (78,942)
Forfeited (23,551) (8,443) 0
Nonvested balance, ending 116,245 135,471 154,998
Weighted Average Grant-Date Fair Value      
Nonvested balance, beginning $ 20.13 $ 16.97 $ 11.55
Granted 22.74 22.52 22.49
Vested 18.71 15.23 9.86
Forfeited 20.90 15.03 0.00
Nonvested balance, ending $ 21.13 $ 20.13 $ 16.97