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Earnings Per Common Share - Computation of Basic and Diluted Weighted Average Common Shares (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Weighted average basic shares 8,801,657 8,504,240 8,855,444 8,420,680
Total weighted average diluted shares 8,801,657 8,504,240 8,855,444 8,420,680