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Investment Securities (Tables) | 12 Months Ended
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Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Investments by contractual maturity date |
September 30, | 2014
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Yield
Gains |  | Losses |
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |  |  |
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
1 to 5 years | $ | 171,154 |  |  | $ | 2,585 |  |  | $ | (748 | ) |  | $ | 172,991 |  |  | 1.26 | %
5 to 10 years | 203,317 |  |  | 300 |  |  | (102 | ) |  | 203,515 |  |  | 1.45 | %
Over 10 years | 354,828 |  |  | 1,028 |  |  | (419 | ) |  | 355,437 |  |  | 1.25 | %
Equity Securities |  |  |  |  |  |  |  |  |
1 to 5 years | 100,500 |  |  | 887 |  |  | — |  |  | 101,387 |  |  | 1.90 | %
5 to 10 years | — |  |  | — |  |  | — |  |  | — |  |  | — | %
Corporate bonds due |  |  |  |  |  |  |  |  |
Within 1 year | 15,000 |  |  | 75 |  |  | — |  |  | 15,075 |  |  | 1.00 | %
1 to 5 years | 302,540 |  |  | 2,372 |  |  | — |  |  | 304,912 |  |  | 0.71 | %
5 to 10 years | 138,201 |  |  | 1,789 |  |  | (970 | ) |  | 139,020 |  |  | 1.43 | %
Over 10 years | 50,000 |  |  | — |  |  | — |  |  | 50,000 |  |  | 3.00 | %
Municipal bonds due |  |  |  |  |  |  |  |  |
Over 10 years | 20,402 |  |  | 3,279 |  |  | — |  |  | 23,681 |  |  | 6.45 | %
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,561,639 |  |  | 24,893 |  |  | (2,024 | ) |  | 1,584,508 |  |  | 2.57 | %
Other commercial MBS | 98,851 |  |  | 65 |  |  |  |  | 98,916 |  |  | 1.49 | %
| 3,016,432 |  |  | 37,273 |  |  | (4,263 | ) |  | 3,049,442 |  |  | 1.99 | %
Held-to-maturity securities |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,548,265 |  |  | 4,855 |  |  | (53,902 | ) |  | 1,499,218 |  |  | 3.13 | %
| 1,548,265 |  |  | 4,855 |  |  | (53,902 | ) |  | 1,499,218 |  |  | 3.13 | %
| $ | 4,564,697 |  |  | $ | 42,128 |  |  | $ | (58,165 | ) |  | $ | 4,548,660 |  |  | 2.38 | %
September 30, | 2013
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Yield
| Gains |  | Losses |
| (In thousands)
Available-for-sale securities |  |  |  |  |  |  |  |  |
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
1 to 5 years | $ | 61,002 |  |  | $ | 3,393 |  |  | $ | (252 | ) |  | $ | 64,143 |  |  | 1.98 | %
5 to 10 years | 129,219 |  |  | — |  |  | (1,547 | ) |  | 127,672 |  |  | 0.86 | %
Over 10 years | 344,571 |  |  | — |  |  | (2,411 | ) |  | 342,160 |  |  | 0.93 | %
Equity Securities |  |  |  |  |  |  |  |  |
1 to 5 years | 500 |  |  | 11 |  |  | — |  |  | 511 |  |  | 2.17 | %
5 to 10 years | 100,000 |  |  | 726 |  |  | — |  |  | 100,726 |  |  | 1.80 | %
Corporate bonds due |  |  |  |  |  |  |  |  |
Within 1 year | 19,500 |  |  | 3 |  |  | — |  |  | 19,503 |  |  | 0.49 | %
1 to 5 years | 317,190 |  |  | 1,980 |  |  | (130 | ) |  | 319,040 |  |  | 0.75 | %
5 to 10 years | 113,060 |  |  | 1,180 |  |  | (768 | ) |  | 113,472 |  |  | 1.53 | %
Municipal bonds due |  |  |  |  |  |  |  |  |
Over 10 years | 20,422 |  |  | 2,123 |  |  | — |  |  | 22,545 |  |  | 6.45 | %
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,245,400 |  |  | 10,270 |  |  | (4,494 | ) |  | 1,251,176 |  |  | 2.18 | %
| 2,350,864 |  |  | 19,686 |  |  | (9,602 | ) |  | 2,360,948 |  |  | 1.70 | %
Held-to-maturity securities |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 1,654,666 |  |  | 3,387 |  |  | (75,204 | ) |  | 1,582,849 |  |  | 3.14 | %
| 1,654,666 |  |  | 3,387 |  |  | (75,204 | ) |  | 1,582,849 |  |  | 3.14 | %
| $ | 4,005,530 |  |  | $ | 23,073 |  |  | $ | (84,806 | ) |  | $ | 3,943,797 |  |  | 2.30 | %
Schedule of unrealized losses and fair value of securities | The following table shows the unrealized gross losses and fair value of securities at September 30, 2014 and September 30, 2013, by length of time that individual securities in each category have been in a continuous loss position. The Bank had $1,642,718,000 securities in a continuous loss position for 12 or more months at September 30, 2014, and $190,357,000 securities in a continuous loss position for 12 months at September 30, 2013, which consisted of corporate bonds, U.S. government and agency securities, and mortgage-backed securities. Management believes that the declines in fair value of these investments are not an other than temporary impairment as these losses are due to a change in interest rates rather than any credit deterioration. The impairment is also deemed to be temporary because: 1) the Bank does not intend to sell the security, and 2) It is not more likely than not that it will be required to sell the security before recovery of the entire amortized cost basis of the security.
As of September 30, | 2014
| Less than 12 months | 12 months or more | Total
| Unrealized Gross Losses | Fair Value | Unrealized Gross Losses | Fair Value | Unrealized Gross Losses | Fair Value
| (In thousands)
Corporate Bonds | $ | (125 | ) | $ | 24,875 |  | $ | (845 | ) | $ | 24,155 |  | $ | (970 | ) | $ | 49,030 |
U.S. agency securities | (472 | ) | 316,578 |  | (797 | ) | 109,354 |  | (1,269 | ) | 425,932 |
Agency pass-through certificates | (215 | ) | 19,212 |  | (55,711 | ) | 1,509,209 |  | (55,926 | ) | 1,528,421 |
| $ | (812 | ) | $ | 360,665 |  | $ | (57,353 | ) | $ | 1,642,718 |  | $ | (58,165 | ) | $ | 2,003,383 |

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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=27724398&loc=d3e27290-111563 + Details
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