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Earnings Per Common Share - Additional Information (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share, Basic [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0 0