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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2013
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 March 31, 2013:
| Fair Value at March 31, 2013
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |
Equity securities | $ | — |  |  | $ | 531 |  |  | $ | — |  |  | $ | 531 |
Obligations of U.S. government | — |  |  | 489,523 |  |  | — |  |  | 489,523 |
Obligations of states and political subdivisions | — |  |  | 24,803 |  |  | — |  |  | 24,803 |
Obligations of foreign governments | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities | — |  |  | 404,112 |  |  | — |  |  | 404,112 |
Mortgage-backed securities |  |  |  |  | — |  |  |
Agency pass-through certificates | — |  |  | 1,103,699 |  |  | — |  |  | 1,103,699 |
Other debt securities | — |  |  | — |  |  | — |  |  | — |
Balance at end of period | $ | — |  |  | $ | 2,022,668 |  |  | $ | — |  |  | $ | 2,022,668 |
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 through the six months ended March 31, 2013, and the total losses resulting from those fair value adjustments for the quarter and six months ended March 31, 2013. The following estimated fair values are shown gross of estimated selling costs:
| Through March 31, 2013 |  | Quarter Ended March 31, 2013 |  | Six Months Ended March 31, 2013
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Total Losses
| (In thousands) |  |
Impaired loans (1) | $ | — |  |  | $ | — |  |  | $ | 45,966 |  |  | $ | 45,966 |  |  | $ | 1,225 |  |  | $ | 11,038 |
Covered REO (2) | — |  |  | — |  |  | 13,988 |  |  | 13,988 |  |  | 281 |  |  | 372 |
Real estate held for sale (2) | — |  |  | — |  |  | 54,069 |  |  | 54,069 |  |  | 6,488 |  |  | 14,024 |
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | 114,023 |  |  | $ | 114,023 |  |  | $ | 7,994 |  |  | $ | 25,434 |
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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.
Fair Value of Financial Instruments by Balance Sheet Grouping | 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, 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 |  | $ | 782,059 |  |  | $ | 782,059 |  |  | $ | 751,430 |  |  | $ | 751,430 |
Available-for-sale securities |  | 2 |  |  |  |  |  |  |  |
Equity securities |  |  |  | 531 |  |  | 531 |  |  | — |  |  | — |
Obligations of U.S. government |  |  |  | 489,523 |  |  | 489,523 |  |  | 183,560 |  |  | 183,560 |
Obligations of states and political subdivisions |  |  |  | 24,803 |  |  | 24,803 |  |  | 24,844 |  |  | 24,844 |
Obligations of foreign governments |  |  |  | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities |  |  |  | 404,112 |  |  | 404,112 |  |  | 403,325 |  |  | 403,325 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |
Agency pass-through certificates |  |  |  | 1,103,699 |  |  | 1,103,699 |  |  | 1,169,976 |  |  | 1,169,976 |
Other debt securities |  |  |  | — |  |  | — |  |  | — |  |  | — |
Total available-for-sale securities |  |  |  | 2,022,668 |  |  | 2,022,668 |  |  | 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 |  |  |  | 1,469,983 |  |  | 1,469,229 |  |  | 1,190,692 |  |  | 1,216,421 |
Other debt securities |  |  |  | — |  |  | — |  |  | — |  |  | — |
Total held-to-maturity securities |  |  |  | 1,469,983 |  |  | 1,469,229 |  |  | 1,191,487 |  |  | 1,217,223 |
Loans receivable |  | 3 |  | 7,444,216 |  |  | 8,059,053 |  |  | 7,451,998 |  |  | 7,949,892 |
Covered loans |  | 3 |  | 355,515 |  |  | 365,138 |  |  | 288,376 |  |  | 289,754 |
FDIC indemnification asset |  | 3 |  | 80,391 |  |  | 78,108 |  |  | 87,571 |  |  | 85,846 |
FHLB stock |  | 2 |  | 152,038 |  |  | 152,038 |  |  | 149,840 |  |  | 149,840 |
Financial liabilities |  |  |  |  |  |  |  |  |  |
Customer accounts |  | 2 |  | 9,152,225 |  |  | 8,861,670 |  |  | 8,576,618 |  |  | 8,406,432 |
FHLB advances and other borrowings |  | 2 |  | 1,930,000 |  |  | 2,145,399 |  |  | 1,880,000 |  |  | 2,110,223 |
Reconciliation of Amortized Cost to Fair Value of Available-for-Sale and Held-to-Maturity Securities | The following is a reconciliation of amortized cost to fair value of available-for-sale and held-to-maturity securities:
| March 31, 2013
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Yield
| Gains |  | Losses |
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |  |  |
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
Within 1 year | $ | 16,952 |  |  | $ | 31 |  |  | $ | (29 | ) |  | $ | 16,954 |  |  | 0.45 | %
1 to 5 years | 58,000 |  |  | 2,576 |  |  | — |  |  | 60,576 |  |  | 1.55 |
5 to 10 years | 83,300 |  |  | 1,664 |  |  | — |  |  | 84,964 |  |  | 1.36 |
Over 10 years | 327,404 |  |  | 156 |  |  | — |  |  | 327,560 |  |  | 0.90 |
Corporate bonds due |  |  |  |  |  |  |  |  |
Within 1 year | 19,500 |  |  | 11 |  |  | — |  |  | 19,511 |  |  | 0.49 |
1 to 5 years | 317,044 |  |  | 4,078 |  |  | — |  |  | 321,122 |  |  | 0.84 |
5 to 10 years | 62,962 |  |  | 998 |  |  | (481 | ) |  | 63,479 |  |  | 2.02 |
Municipal bonds due |  |  |  |  |  |  |  |  |
Over 10 years | 20,430 |  |  | 4,373 |  |  | — |  |  | 24,803 |  |  | 6.45 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,098,266 |  |  | 6,421 |  |  | (988 | ) |  | 1,103,699 |  |  | 1.99 |
| 2,003,858 |  |  | 20,308 |  |  | (1,498 | ) |  | 2,022,668 |  |  | 1.61 |
Held-to-maturity securities |  |  |  |  |  |  |  |  |
Tax-exempt municipal bonds due |  |  |  |  |  |  |  |  |
Within 1 year | — |  |  | — |  |  | — |  |  | — |  |  | — |
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
5 to 10 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
Over 10 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,469,983 |  |  | 3,302 |  |  | (4,056 | ) |  | 1,469,229 |  |  | 3.04 |
| 1,469,983 |  |  | 3,302 |  |  | (4,056 | ) |  | 1,469,229 |  |  | 3.04 |
| $ | 3,473,841 |  |  | $ | 23,610 |  |  | $ | (5,554 | ) |  | $ | 3,491,897 |  |  | 2.22 | %
| September 30, 2012
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Yield
| Gains | Losses |
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |  |  |
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
Within 1 year | $ | 19,999 |  |  | $ | 42 |  |  | $ | (6 | ) |  | $ | 20,035 |  |  | 0.57 | %
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
5 to 10 years | 59,300 |  |  | 4,225 |  |  | — |  |  | 63,525 |  |  | 2.21 |
Over 10 years | 100,000 |  |  | — |  |  | — |  |  | 100,000 |  |  | 1.05 |
Corporate bonds due |  |  |  |  |  |  |  |  |
1 to 5 years | 336,340 |  |  | 2,810 |  |  | (61 | ) |  | 339,089 |  |  | 0.91 |
5 to 10 years | 62,919 |  |  | 1,324 |  |  | (7 | ) |  | 64,236 |  |  | 2.73 |
Municipal bonds due |  |  |  |  |  |  |  |  |
Over 10 years | 20,442 |  |  | 4,402 |  |  | — |  |  | 24,844 |  |  | 6.45 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,161,668 |  |  | 9,358 |  |  | (1,050 | ) |  | 1,169,976 |  |  | 2.28 |
| 1,760,668 |  |  | 22,161 |  |  | (1,124 | ) |  | 1,781,705 |  |  | 1.99 |
Held-to-maturity securities |  |  |  |  |  |  |  |  |
Tax-exempt municipal bonds due |  |  |  |  |  |  |  |  |
Within 1 year | 795 |  |  | 7 |  |  | — |  |  | 802 |  |  | 5.80 |
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
5 to 10 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
Over 10 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,190,692 |  |  | 25,729 |  |  | — |  |  | 1,216,421 |  |  | 3.10 |
| 1,191,487 |  |  | 25,736 |  |  | — |  |  | 1,217,223 |  |  | 3.10 |
| $ | 2,952,155 |  |  | $ | 47,897 |  |  | $ | (1,124 | ) |  | $ | 2,998,928 |  |  | 2.44 | %
Schedule of Unrealized Losses and Fair Value of Securities | The following table shows the unrealized gross losses and fair value of securities at March 31, 2013, by length of time that individual securities in each category have been in a continuous loss position. Management believes that the declines in fair value of these investments are not an other than temporary impairment.
| Less than 12 months |  | 12 months or more |  | Total
| Unrealized Gross Losses |  | Fair Value |  | Unrealized Gross Losses |  | Fair Value |  | Unrealized Gross Losses |  | Fair Value
Corporate bonds due | $ | — |  |  | $ | — |  |  | $ | (481 | ) |  | $ | 9,519 |  |  | $ | (481 | ) |  | $ | 9,519 |
U.S. government and agency securities due | (29 | ) |  | 16,423 |  |  | — |  |  | — |  |  | (29 | ) |  | 16,423 |
Agency pass-through certificates | (4,239 | ) |  | 943,909 |  |  | (805 | ) |  | 175,871 |  |  | (5,044 | ) |  | 1,119,780 |
| (4,268 | ) |  | $ | 960,332 |  |  | $ | (1,286 | ) |  | $ | 185,390 |  |  | (5,554 | ) |  | $ | 1,145,722 |

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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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- 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 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 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 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 4: 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 5: 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 6: 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. Reference 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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