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Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Number of Restricted Shares    
Nonvested balance, beginning 77,499 84,709
Granted 500 32,261
Vested (913) (39,471)
Forfeited (4,469) 0
Nonvested balance, ending 72,617 77,499
Weighted Average Grant-Date Fair Value    
Nonvested balance, beginning $ 33.94 $ 23.10
Granted 46.60 44.98
Vested 44.23 19.71
Forfeited 31.37 0.00
Nonvested balance, ending $ 34.05 $ 33.94