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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Number of Restricted Shares    
Nonvested balance, beginning 135,471 154,998
Granted 50,700 53,790
Vested (53,000) (64,874)
Forfeited (12,992) (8,443)
Nonvested balance, ending 120,179 135,471
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 20.13 $ 16.97
Granted 22.98 22.52
Vested 18.73 15.23
Forfeited 18.96 15.03
Nonvested balance, ending $ 21.22 $ 20.13