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Stockholders' Equity - Narrative (Details) (USD $) | 12 Months Ended |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 The Company | Sep. 30, 2013 The Company | Sep. 30, 2014 The Bank | Sep. 30, 2013 The Bank | Jan. 01, 2015 Scenario, Forecast The Company | Jan. 01, 2015 Scenario, Forecast The Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Tier one capital required for capital adequacy to tangible assets |  |  |  |  |  |  | 4.50% | 4.50%
Tier one leverage capital required for capital adequacy to average assets |  |  | 4.00% | 4.00% | 4.00% | 4.00% | 4.00% | 4.00%
Tier one risk based capital required for capital adequacy to risk weighted assets |  |  | 4.00% | 4.00% | 4.00% | 4.00% | 6.00% | 6.00%
Capital required for capital adequacy to risk weighted assets |  |  | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% | 8.00%
Tier one capital required for capital adequacy to risk weighted assets, conservation buffer |  |  |  |  |  |  | 2.50% | 2.50%
Tier one leverage capital required to be well capitalized to average assets |  |  |  |  | 5.00% | 5.00% |  | 5.00%
Tier one capital required to be well capitalized to risk weighted assets |  |  |  |  |  |  |  | 6.50%
Tier one risk based capital required to be well capitalized to risk weighted assets |  |  |  |  | 6.00% | 6.00% |  | 8.00%
Capital required to be well capitalized to risk weighted assets |  |  |  |  | 10.00% | 10.00% |  | 10.00%
Stock repurchased | 4,830,400 | 6,315,196 |  |  |  |  |  |
Weighted average cost of repurchased stock | $ 21.59 | $ 17.46 |  |  |  |  |  |
Additional shares authorized to be repurchased | 5,035,834 |  |  |  |  |  |  |
Warrants issued (in shares) | 1,707,456 |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | 17.57 |  |  |  |  |  |  |
Warrants outstanding | 1,700,856,000 |  |  |  |  |  |  |

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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 + Details
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