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Stock-Based Compensation Plan - Options (Details) - Stock option - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Additional disclosures          
Compensation cost $ 107,000 $ 178,000 $ 272,000 $ 350,000  
Unamortized compensation cost 159,000   $ 159,000    
Amortization period (in months)     10 months    
Total income tax benefits related to stock options exercised $ 0 $ 91,000 $ 108,000 $ 283,000  
Amended and Restated 2008 Option Plan          
Shares          
Outstanding at the beginning of the year (in shares)     1,976,247    
Granted (in shares)     0 0  
Exercised (in shares)     (127,157)    
Forfeited or expired (in shares)     (1,563)    
Outstanding at the end of the year (in shares) 1,847,527   1,847,527   1,976,247
Exercisable at the end of the year (in shares) 1,764,502   1,764,502    
Weighted-Average Exercise Price          
Outstanding at the beginning of the year (in dollars per share)     $ 8.00    
Exercised (in dollars per share)     6.83    
Forfeited or expired (in dollars per share)     11.52    
Outstanding at the end of the year (in dollars per share) $ 8.08   8.08   $ 8.00
Exercisable at the end of the year (in dollars per share) $ 7.91   $ 7.91    
Additional disclosures          
Outstanding Weighted-Average Remaining Contractual Term (in years)     4 years 6 months 29 days   4 years 11 months 23 days
Exercisable Weighted-Average Remaining Contractual Term (in years)     4 years 5 months 19 days    
Outstanding Aggregate Intrinsic Value $ 20,957,235   $ 20,957,235    
Exercisable Aggregate Intrinsic Value $ 20,303,063