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Stockholders' Equity - Narrative (Details) - $ / shares
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Class of Stock [Line Items]    
Tier one capital required for capital adequacy to risk weighted assets, conservation buffer 2.50%  
Stock repurchased 5,841,204 4,830,400
Additional shares authorized to be repurchased 4,201,230  
Warrants issued (in shares) 1,707,456  
Warrant exercise price (in dollars per share) $ 17.57  
Warrants outstanding 1,700,856,000  
Weighted Average    
Class of Stock [Line Items]    
Weighted average cost of repurchased stock (in dollars per share) $ 21.70 $ 21.59