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Stock-Based Compensation Plan - Restricted stock (Details) - Restricted stock - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Weighted Average Grant Date Fair Value    
Unrecognized compensation cost $ 3.0  
Weighted-average recognition period (in months) 38 months  
Amended and Restated 2008 Option Plan    
Number of Shares    
Balance at the beginning of the year (in shares) 72,743  
Granted (in shares) 116,488 0
Vested (in shares) (250)  
Forfeited (in shares) (115)  
Balance at the end of the year (in shares) 188,866  
Weighted Average Grant Date Fair Value    
Outstanding at the beginning of the year (in dollars per share) $ 18.82  
Granted (in dollars per share) 17.49  
Vested (in dollars per share) 17.25  
Forfeited (in dollars per share) 19.07  
Outstanding at the end of the year (in dollars per share) $ 18.00