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Stock Options - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 11, 2020
Mar. 15, 2019
Aug. 24, 2018
Jan. 05, 2018
Mar. 24, 2017
Aug. 27, 2015
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Employee Stock Purchase Plan                        
Options, outstanding (in shares)           35,250 864,300 635,550 864,300 635,550 625,800 395,550
Granted (in shares)           58,125     238,500 240,000    
Granted (in dollars per share)           $ 28.02     $ 25.34 $ 28.01    
Exercisable period (in years)           5 years            
Expiration (in years)           10 years            
Employee Stock Option                        
Employee Stock Purchase Plan                        
Expiration (in years)                 10 years      
Compensation expense             $ 238 $ 177 $ 436 $ 313    
Number of exercisable options (in shares)             62,625   62,625      
Weighted average remaining contractual term (in years)                 8 years 6 months 18 days      
Fair value of options granted                 $ 1,343      
Fair value of options granted (in dollars per share)                 $ 5.63      
Unrecognized compensation cost for non-vested shares             $ 2,404   $ 2,404      
Period for recognition (in years)                 1 year 6 months 18 days      
Tranche One                        
Employee Stock Purchase Plan                        
Options, outstanding (in shares) 119,300 118,950 73,350 18,750 62,625              
Granted (in shares) 119,300 120,900 75,300 18,750 69,375       119,300      
Granted (in dollars per share) $ 25.34 $ 28.01 $ 30.67 $ 30.07 $ 29.47              
Exercisable period (in years) 3 years 3 years 3 years 3 years 3 years              
Expiration (in years) 10 years 10 years 10 years 10 years 10 years              
Tranche One | Employee Stock Option                        
Employee Stock Purchase Plan                        
Exercisable period (in years)                 3 years      
Tranche Two                        
Employee Stock Purchase Plan                        
Options, outstanding (in shares) 119,200 117,300 145,200 18,750 35,625              
Granted (in shares) 119,200 119,100 149,250 18,750 35,625       119,200      
Granted (in dollars per share) $ 25.34 $ 28.01 $ 30.67 $ 30.07 $ 29.47              
Exercisable period (in years) 5 years 5 years 5 years 5 years 5 years              
Expiration (in years) 10 years 10 years 10 years 10 years 10 years              
Tranche Two | Employee Stock Option                        
Employee Stock Purchase Plan                        
Exercisable period (in years)                 5 years