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Derivatives and Hedging Activities (Tables) | 9 Months Ended
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Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Fair Value and Balance Sheet Classification | Although management is not aware of any factors that would materially affect the estimated fair value amounts presented below, such amounts have not been comprehensively revalued for purposes of these financial statements since the dates shown, and therefore, estimates of fair value subsequent to those dates may differ significantly from the amounts presented below.
|  |  |  | June 30, 2013 |  | September 30, 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 |  | $ | 646,857 |  |  | $ | 646,857 |  |  | $ | 751,430 |  |  | $ | 751,430 |
Available-for-sale securities |  | 2 |  |  |  |  |  |  |  |
Equity securities |  |  |  | 514 |  |  | 514 |  |  | — |  |  | — |
Obligations of U.S. government |  |  |  | 545,585 |  |  | 545,585 |  |  | 183,560 |  |  | 183,560 |
Obligations of states and political subdivisions |  |  |  | 22,545 |  |  | 22,545 |  |  | 24,844 |  |  | 24,844 |
Obligations of foreign governments |  |  |  | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities |  |  |  | 452,111 |  |  | 452,111 |  |  | 403,325 |  |  | 403,325 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Agency pass-through certificates |  |  |  | 1,037,389 |  |  | 1,037,389 |  |  | 1,169,976 |  |  | 1,169,976 |
Other debt securities |  |  |  | — |  |  | — |  |  | — |  |  | — |
Total available-for-sale securities |  |  |  | 2,058,144 |  |  | 2,058,144 |  |  | 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 |  |  |  | 1,589,779 |  |  | 1,522,470 |  |  | 1,190,692 |  |  | 1,216,421 |
Other debt securities |  |  |  | — |  |  | — |  |  | — |  |  | — |
Total held-to-maturity securities |  |  |  | 1,589,779 |  |  | 1,522,470 |  |  | 1,191,487 |  |  | 1,217,223 |
Loans receivable |  | 3 |  | 7,390,506 |  |  | 7,913,399 |  |  | 7,451,998 |  |  | 7,949,892 |
Covered loans |  | 3 |  | 310,378 |  |  | 317,244 |  |  | 288,376 |  |  | 289,754 |
FDIC indemnification asset |  | 3 |  | 73,665 |  |  | 73,182 |  |  | 87,571 |  |  | 85,846 |
FHLB stock |  | 2 |  | 150,533 |  |  | 150,533 |  |  | 149,840 |  |  | 149,840 |
Financial liabilities |  |  |  |  |  |  |  |  |  |
Customer accounts |  | 2 |  | 9,063,497 |  |  | 8,615,872 |  |  | 8,576,618 |  |  | 8,406,432 |
FHLB advances and other borrowings |  | 2 |  | 1,930,000 |  |  | 2,071,867 |  |  | 1,880,000 |  |  | 2,110,223 |
The following table presents the fair value and balance sheet classification of derivatives not designated as hedging instruments at June 30, 2013 and September 30, 2012:
|  | Asset Derivatives |  | Liability Derivatives
|  | June 30, 2013 |  | September 30, 2012 |  | June 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 |  | $ | 524 |  |  | Other assets |  | N/A |  | Other liabilities |  | $ | 524 |  |  | Other liabilities |  | N/A
Commitments to purchase MBS |  | AFS securities |  | 2,875 |  |  | AFS securities |  | N/A |  | N/A |  | N/A |  | N/A |  | N/A

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -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 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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 Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -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 4: 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=7578670&loc=d3e19207-110258 Reference 5: 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=7491637&loc=d3e13433-108611 Reference 6: 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=7491637&loc=d3e13467-108611 Reference 7: 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=7491637&loc=d3e13476-108611 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 9: 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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -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 11: 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 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -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. + Details
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