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Equity Incentive Plan - Summary of Restricted Share Awards (Details) - Restricted Stock - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Summary of company's restricted share awards    
Number of Shares, Nonvested at beginning of the period (in shares) 110,825 170,480
Number of shares, granted (in shares) 5,000 0
Number of Shares, Vested (in shares) (29,458) (59,655)
Number of shares forfeited (in shares) (25,870) 0
Number of Shares, Nonvested at end of the period (in shares) 60,497 110,825
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) $ 22.05 $ 21.38
Weighted - Average Grant Date Fair Value, Granted (in dollars per share) 20.20 0.00
Weighted - Average Grant Date Fair Value, Vested (in dollars per share) 25.55 20.14
Weighted - Average Grant Date Fair Value, Forfeited (in dollars per share) 13.17 0.00
Weighted - Average Grant Date Fair Value, Nonvested at end of the period (in dollars per share) $ 23.99 $ 22.05