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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Number of Restricted Shares    
Nonvested balance, beginning 135,471 154,998
Granted 2,905 53,790
Vested (2,246) (64,874)
Forfeited (2,044) (8,443)
Nonvested balance, ending 134,086 135,471
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 20.13 $ 16.97
Granted 21.68 22.52
Vested 21.35 15.23
Forfeited 14.50 15.03
Nonvested balance, ending $ 20.23 $ 20.13