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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 |

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