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Stock-based Compensation - Stock Option Awards (Details) - Stock Options - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Stock Option Awards [Abstract]      
Term of awards 10 years    
Shares      
Outstanding, beginning of period (in shares) 121,260    
Granted (in shares) 8,225    
Exercised (in shares) (14,434)    
Forfeited (in shares) (2,205)    
Outstanding, end of period (in shares) 112,846   121,260
Exercisable (in shares) 97,046    
Expected to vest, assuming a 0% forfeiture rate over the vesting term (in shares) 16,169    
Weighted- Average Exercise Price      
Outstanding, beginning of period (in dollars per share) $ 20.80    
Granted (in dollars per share) 36.26    
Exercised (in dollars per share) 15.99    
Forfeited (in dollars per share) 29.25    
Outstanding, end of period (in dollars per share) 22.38   $ 20.80
Exercisable (in dollars per share) 20.65    
Expected to vest, assuming a 0% forfeiture rate over the vesting term (in dollars per share) $ 34.19    
Options, Additional Disclosures [Abstract]      
Forfeiture rate 0.00%    
Outstanding, weighted-average remaining contractual term 4 years 8 months 26 days   5 years 3 months 29 days
Exercisable, weighted-average remaining contractual term 4 years 1 month 20 days    
Expected to vest, assuming a 0% forfeiture rate over the vesting term, weighted-average remaining contractual term 7 years 10 months 9 days    
Outstanding, aggregate intrinsic value $ 501,807   $ 1,842,687
Exercisable, aggregate intrinsic value 489,312    
Expected to vest, assuming a 0% forfeiture rate over the vesting term, aggregate intrinsic value 1,662    
Unrecognized compensation cost $ 89,000    
Share-based compensation arrangement, fair value assumptions and methodology [Abstract]      
Annual dividend yield 1.60% 1.72%  
Expected volatility 21.67% 21.68%  
Risk-free interest rate 1.38% 2.64%  
Expected term 6 years 6 months 6 years 6 months  
Weighted-average grant date fair value per option granted (in dollars per share) $ 7.14 $ 7.24  
Maximum      
Options, Additional Disclosures [Abstract]      
Remaining weighted-average vesting period 2 years 10 months 20 days    
2008 Plan      
Stock Option Awards [Abstract]      
Annual vesting percentage 20.00%    
Vesting commencement period from grant date 1 year    
2013 Plan | Minimum      
Stock Option Awards [Abstract]      
Award vesting period 1 year    
2013 Plan | Maximum      
Stock Option Awards [Abstract]      
Award vesting period 4 years