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Fair Values of Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2013
Fair Value Disclosures [Abstract] |
Fair value of financial instruments by balance sheet grouping | The following table presents the fair value and balance sheet classification of derivatives not designated as hedging instruments at September 30, 2013 and September 30, 2012:
|  | Asset Derivatives |  | Liability Derivatives
|  | September 30, 2013 |  | September 30, 2012 |  | September 30, 2013 |  | September 30, 2012
|  | Balance Sheet |  |  |  | Balance Sheet |  |  |  | Balance Sheet |  |  |  | Balance Sheet |  |
|  | Location |  | Fair Value |  | Location |  | Fair Value |  | Location |  | Fair Value |  | Location |  | Fair Value
|  | (In thousands)
Interest rate contracts |  | Other assets |  | $ | 7 |  |  | N/A |  | N/A |  | Other liabilities |  | $ | 7 |  |  | N/A |  | N/A
Commitments to purchase MBS |  | AFS securities |  | 3,188 |  |  | N/A |  | N/A |  | N/A |  | N/A |  | N/A |  | N/A
|  | 2013 | 2012
| Level in Fair Value Hierarchy | Carrying Amount | Estimated Fair Value | Carrying Amount | Estimated Fair Value
|  | (In thousands)
Financial assets |  |  |  |  |
Cash and cash equivalents | 1 | $ | 203,563 |  | $ | 203,563 |  | $ | 751,430 |  | $ | 751,430 |
Available-for-sale securities: |  |  |  |  |
Equity securities | 1 | 101,237 |  | 101,237 |  |  |  | — |
Obligations of U.S. government | 2 | 533,975 |  | 533,975 |  | 183,560 |  | 183,560 |
Obligations of states and political subdivisions | 2 | 22,545 |  | 22,545 |  | 24,844 |  | 24,844 |
Obligations of foreign governments |  | — |  | — |  | — |  | — |
Corporate debt securities | 2 | 452,015 |  | 452,015 |  | 403,325 |  | 403,325 |
Mortgage-backed securities |  |  |  |  |
Agency pass-through certificates | 2 | 1,251,176 |  | 1,251,176 |  | 1,169,976 |  | 1,169,976 |
Other debt securities |  | — |  | — |  | — |  | — |
Total available-for-sale securities |  | 2,360,948 |  | 2,360,948 |  | 1,781,705 |  | 1,781,705 |
Held-to-maturity securities: | 2 |  |  |  |
Equity securities |  | — |  | — |  | — |  | — |
Obligations of U.S. government |  | — |  | — |  | — |  | — |
Obligations of states and political subdivisions |  | — |  | — |  | 795 |  | 802 |
Obligations of foreign governments |  | — |  | — |  | — |  | — |
Corporate debt securities |  | — |  | — |  | — |  | — |
Mortgage-backed securities |  |  |  |  |
Agency pass-through certificates |  | 1,654,666 |  | 1,582,849 |  | 1,190,692 |  | 1,216,421 |
Other debt securities |  | — |  | — |  | — |  | — |
Total held-to-maturity securities |  | 1,654,666 |  | 1,582,849 |  | 1,191,487 |  | 1,217,223 |
Loans receivable | 3 | 7,528,030 |  | 8,070,279 |  | 7,451,998 |  | 7,949,892 |
Covered loans | 3 | 295,947 |  | 300,610 |  | 288,376 |  | 289,754 |
FDIC indemnification asset | 3 | 64,615 |  | 62,300 |  | 87,571 |  | 85,846 |
FHLB stock | 2 | 173,009 |  | 173,009 |  | 149,840 |  | 149,840 |
Financial liabilities |  |  |  |  |
Customer accounts | 2 | 9,090,271 |  | 8,585,068 |  | 8,576,618 |  | 8,406,432 |
FHLB advances and other borrowings | 2 | 1,930,000 |  | 2,064,248 |  | 1,880,000 |  | 2,110,223 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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