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Earnings Per Common Share - Computation of Basic and Diluted Weighted Average Common Shares (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Weighted average basic shares 8,598,461 8,327,009 8,478,848 8,294,268
Total weighted average diluted shares 8,598,461 8,327,009 8,478,848 8,294,268