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Dividends and Share Repurchases (Details) - $ / shares |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 23, 2018 | May 25, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends per share (in dollars per share) |  | $ 0.17 | $ 0.17 | $ 0.15 | $ 0.49 | $ 0.69
Stock repurchased (in shares) |  |  | 1,224,384 |  |  |
Average cost per share (in dollars per share) |  |  | $ 32.64 |  |  |
Warrants outstanding (in shares) |  |  | 107,617 |  | 107,617 |
Remaining shares authorized to be repurchased (in shares) |  |  | 2,855,765 |  | 2,855,765 |
2008 Troubled Asset Relief Program |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Stock issued during period (in shares) |  |  | 2,329 |  |  |
Subsequent Event |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.18 |  |  |  |  |

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