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Share-Based Compensation - Restricted Common Stock Awards (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Nonvested outstanding shares at beginning of period (shares) 63,768 93,501 53,028
Granted (shares) 22,204 22,204 54,650
Vested (shares) (20,733) (27,373) (12,438)
Forfeited (shares) (1,710) (2,360) (1,739)
Nonvested outstanding shares at end of period (shares) 63,529 63,768 93,501
Weighted Average Grant Date Fair Value      
Nonvested outstanding shares at beginning of period (in dollars per share) $ 13.33 $ 13.35 $ 12.34
Granted (in dollars per share) 20.76   14.10
Vested (in dollars per share) 13.09 13.34 12.38
Forfeited (in dollars per share) 14.37 14.07 12.95
Nonvested outstanding shares at end of period (in dollars per share) $ 15.98 $ 13.33 $ 13.35