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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2012
Fair Value Measurements [Abstract] |
Fair value of assets measured on recurring basis | The following table presents the balance of assets measured at fair value on a recurring basis at September 30, 2012:
| Fair Value at September 30, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |
Equity securities | $ | — |  |  | $ | 541 |  |  | $ | — |  |  | $ | 541 |
Obligations of U.S. government | — |  |  | 183,018 |  |  | — |  |  | 183,018 |
Obligations of states and political subdivisions | — |  |  | 24,844 |  |  | — |  |  | 24,844 |
Obligations of foreign governments | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities | — |  |  | 403,326 |  |  | — |  |  | 403,326 |
Agency pass through mortgage-backed securities | — |  |  | 1,169,976 |  |  | — |  |  | 1,169,976 |
Other debt securities | — |  |  | — |  |  | — |  |  | — |
Balance at end of period | $ | — |  |  | $ | 1,781,705 |  |  | $ | — |  |  | $ | 1,781,705 |
Aggregated balance of assets measured at estimated fair value on a nonrecurring basis and total losses resulting from those fair value adjustments | The following table presents the aggregated balance of assets measured at estimated fair value on a nonrecurring basis for the year ended September 30, 2012, and the total losses resulting from those fair value adjustments for the quarter and year ended September 30, 2012. The following estimated fair values are shown gross of estimated selling costs:
| Through September 30, 2012 |  | Quarter Ended September 30, 2012 |  | Year Ended September 30, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Total Losses
| (In thousands) |  |
Impaired loans (1) | $ | — |  |  | $ | — |  |  | $ | 179,626 |  |  | $ | 179,626 |  |  | $ | 6,259 |  |  | $ | 42,550 |
Covered REO (2) | — |  |  | — |  |  | 39,540 |  |  | 39,540 |  |  | 295 |  |  | 2,419 |
Real estate held for sale (2) | — |  |  | — |  |  | 195,930 |  |  | 195,930 |  |  | 17,876 |  |  | 78,976 |
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | 415,096 |  |  | $ | 415,096 |  |  | $ | 24,430 |  |  | $ | 123,945 |
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(1) | The losses represents remeasurements of collateral-dependent loans.
(2) | The losses represents aggregate writedowns and charge-offs on real estate held for sale.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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