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Stockholders' Equity - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
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% 2.50%    
Stock repurchased (in shares)   3,867,563 5,841,204  
Additional shares authorized to be repurchased 5,039,310 5,039,310    
Warrants issued (in shares) 1,707,456 1,707,456    
Warrant exercise price (in dollars per share) $ 17.57 $ 17.57    
Payments for repurchase of warrants $ 7,718,158 $ 7,744,000 $ 0 $ 0
Warrants repurchased during period (in shares) 892,240      
Warrants outstanding (in shares) 808,616 808,616 1,700,856  
Weighted Average        
Class of Stock [Line Items]        
Weighted average cost of repurchased stock (in dollars per share)   $ 22.72 $ 21.70