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Earnings Per Common Share - Additional information (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 12,000 216,759 22,000 29,500
Maximum        
Exercise price $ 4.22 $ 4.22 $ 4.22 $ 4.22
Minimum        
Exercise price $ 4.19 $ 2.96 $ 4.00 $ 3.90