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Earnings Per Common Share - Narrative (Details) - shares
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2015
Officer    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 750,000  
Chief executive Officer and Chief Financial Officer    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares)   12,500