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Earnings Per Share - Schedule of Shares not Considered in Computing Diluted Earnings per Common Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restricted Stock Awards        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive shares 14,513   14,513  
Stock Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive shares 51,952 58,442 51,952 58,442
Performance Stock Units        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive shares 59,658   59,658