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Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 16, 2013
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock Based Compensation [Abstract]          
Stock-Based Compensation expense     $ 0 $ 0 $ 0
Increase in number of common stock shares authorized 233,334        
Percentage to retain annual restricted stock awards 50.00%        
Restricted Stock [Member]          
Stock Based Compensation [Abstract]          
Stock-Based Compensation expense   $ 565,000 554,000 1,124,000 1,105,000
Recognized tax benefits   $ 62,000 $ 63,000 $ 125,000 $ 126,000
Class A Common Stock | Stock Option [Member]          
Stock Based Compensation [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 990,000        
Class A Common Stock | Incentive Compensation Plan [Member]          
Stock Based Compensation [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 620,000        
Class B Common Stock          
Stock Based Compensation [Abstract]          
Increase in number of common stock shares authorized 90,000        
Class B Common Stock | Stock Option [Member]          
Stock Based Compensation [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 370,000        
Class B Common Stock | Incentive Compensation Plan [Member]          
Stock Based Compensation [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 370,000