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Derivatives and Hedging Activities (Tables) | 6 Months Ended
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Mar. 31, 2014
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.
|  |  |  | March 31, 2014 |  | September 30, 2013
|  | Level in Fair Value Hierarchy |  | Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
|  |  |  | (In thousands)
Financial assets |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 1 |  | $ | 608,236 |  |  | $ | 608,236 |  |  | $ | 203,563 |  |  | $ | 203,563 |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |
Equity securities |  | 1 |  | 101,496 |  |  | 101,496 |  |  | 101,237 |  |  | 101,237 |
Obligations of U.S. government |  | 2 |  | 782,257 |  |  | 782,257 |  |  | 533,975 |  |  | 533,975 |
Obligations of states and political subdivisions |  | 2 |  | 22,912 |  |  | 22,912 |  |  | 22,545 |  |  | 22,545 |
Corporate debt securities |  | 2 |  | 434,570 |  |  | 434,570 |  |  | 452,015 |  |  | 452,015 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Agency pass-through certificates |  | 2 |  | 1,709,873 |  |  | 1,709,873 |  |  | 1,251,176 |  |  | 1,251,176 |
Other Commercial MBS |  | 2 |  | 59,467 |  |  | 59,467 |  |  | — |  |  | — |
Total available-for-sale securities |  |  |  | 3,110,575 |  |  | 3,110,575 |  |  | 2,360,948 |  |  | 2,360,948 |
Held-to-maturity securities |  | 2 |  |  |  |  |  |  |  |
Total held-to-maturity securities |  |  |  | 1,611,303 |  |  | 1,527,531 |  |  | 1,654,666 |  |  | 1,582,849 |
Loans receivable |  | 3 |  | 7,737,109 |  |  | 8,205,310 |  |  | 7,528,030 |  |  | 8,070,279 |
Covered loans |  | 3 |  | 229,605 |  |  | 233,275 |  |  | 295,947 |  |  | 300,610 |
FDIC indemnification asset |  | 3 |  | 53,289 |  |  | 52,408 |  |  | 64,615 |  |  | 62,300 |
FHLB and FRB stock |  | 2 |  | 167,174 |  |  | 167,174 |  |  | 173,009 |  |  | 173,009 |
Financial liabilities |  |  |  |  |  |  |  |  |  |
Customer accounts |  | 2 |  | 10,344,891 |  |  | 9,720,995 |  |  | 9,090,271 |  |  | 8,585,068 |
FHLB advances and other borrowings |  | 2 |  | 1,930,000 |  |  | 2,056,430 |  |  | 1,930,000 |  |  | 2,064,248 |
The following table presents the fair value and balance sheet classification of derivatives not designated as hedging instruments at March 31, 2014 and September 30, 2013:
|  | Asset Derivatives |  | Liability Derivatives
|  | March 31, 2014 |  | September 30, 2013 |  | March 31, 2014 |  | September 30, 2013
|  | 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 |  | $ | 322 |  |  | Other assets |  | $ | 7 |  |  | Other liabilities |  | $ | 322 |  |  | Other liabilities |  | $ | 7 |
Commitments to purchase MBS |  | AFS securities |  | — |  |  | AFS securities |  | $ | 3,188 |  |  | N/A |  | N/A |  | N/A |  | N/A

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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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