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Equity Incentive Plan - Summary of Restricted Share Awards (Details) - Restricted Stock - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Summary of company's restricted share awards    
Number of Shares, Nonvested at beginning of the period (in shares) 179,641 158,035
Number of Shares, Granted (in shares) 85,254 87,018
Number of Shares, Vested (in shares) (94,415) (65,412)
Number of Shares, Nonvested at end of the period (in shares) 170,480 179,641
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted - Average Grant Date Fair Value, Nonvested at beginning of the period (in dollars per share) $ 14.92 $ 12.39
Weighted - Average Grant Date Fair Value, Granted (in dollars per share) 26.59 17.46
Weighted - Average Grant Date Fair Value, Vested (in dollars per share) 13.80 12.17
Weighted - Average Grant Date Fair Value, Nonvested at end of the period (in dollars per share) $ 21.38 $ 14.92