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Investment Securities (Tables) | 12 Months Ended
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Sep. 30, 2011
Investment Securities [Abstract] |
Investments by contractual maturity date |
September 30, | 2011
| 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 | $ | 500 |  |  | $ | 34 |  |  | $ | — |  |  | $ | 534 |  |  | 4.00 | %
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — |
5 to 10 years | 9,300 |  |  | 4,547 |  |  | — |  |  | 13,847 |  |  | 10.38 | %
Over 10 years | 175,515 |  |  | 631 |  |  | — |  |  | 176,146 |  |  | 2.57 | %
Corporate bonds due |  |  |  |  |  |  |  |  |
5 to 10 years | 30,000 |  |  | 284 |  |  | (325 | ) |  | 29,959 |  |  | 4.00 | %
Municipal bonds due |  |  |  |  |  |  |  |  |
Over 10 years | 20,461 |  |  | 3,107 |  |  | — |  |  | 23,568 |  |  | 6.45 | %
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 2,883,734 |  |  | 127,356 |  |  | — |  |  | 3,011,090 |  |  | 4.72 | %
| 3,119,510 |  |  | 135,959 |  |  | (325 | ) |  | 3,255,144 |  |  | 4.62 | %
Held-to-maturity securities |  |  |  |  |  |  |  |  |
Tax-exempt municipal bonds due |  |  |  |  |  |  |  |  |
1 to 5 years | 405 |  |  | 5 |  |  | — |  |  | 410 |  |  | 6.52 | %
5 to 10 years | 1,545 |  |  | 68 |  |  | — |  |  | 1,613 |  |  | 5.60 | %
Over 10 years | — |  |  | — |  |  | — |  |  | — |  |  | — | %
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — | %
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 45,086 |  |  | 3,507 |  |  | — |  |  | 48,593 |  |  | 5.31 | %
| 47,036 |  |  | 3,580 |  |  | — |  |  | 50,616 |  |  | 5.33 | %
| $ | 3,166,546 |  |  | $ | 139,539 |  |  | $ | (325 | ) |  | $ | 3,305,760 |  |  | 4.63 | %
September 30, | 2010
| 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 | $ | 500 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 526 |  |  | 4.00 | %
1 to 5 years | 25,000 |  |  | 180 |  |  | — |  |  | 25,180 |  |  | 3.25 | %
5 to 10 years | 158,915 |  |  | 5,344 |  |  | (105 | ) |  | 164,154 |  |  | 3.59 | %
Over 10 years | 150,000 |  |  | 1,161 |  |  | (15 | ) |  | 151,146 |  |  | 3.50 | %
Corporate bonds due |  |  |  |  |  |  |  |  |
5 to 10 years | 10,000 |  |  | — |  |  | — |  |  | 10,000 |  |  | 6.00 | %
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 2,058,130 |  |  | 72,853 |  |  | (896 | ) |  | 2,130,087 |  |  | 5.26 | %
| 2,402,545 |  |  | 79,564 |  |  | (1,016 | ) |  | 2,481,093 |  |  | 5.02 | %
Held-to-maturity securities |  |  |  |  |  |  |  |  |
Tax-exempt municipal bonds due |  |  |  |  |  |  |  |  |
1 to 5 years | 1,105 |  |  | 65 |  |  | — |  |  | 1,170 |  |  | 6.11 | %
5 to 10 years | 1,940 |  |  | 115 |  |  | — |  |  | 2,055 |  |  | 5.67 | %
Over 10 years | 4,010 |  |  | 34 |  |  | — |  |  | 4,044 |  |  | 5.60 | %
U.S. government and agency securities due |  |  |  |  |  |  |  |  |
1 to 5 years | — |  |  | — |  |  | — |  |  | — |  |  | — | %
Mortgage-backed securities |  |  |  |  |  |  |  |  |
Agency pass-through certificates | 73,052 |  |  | 4,579 |  |  | — |  |  | 77,631 |  |  | 5.59 | %
| 80,107 |  |  | 4,793 |  |  | — |  |  | 84,900 |  |  | 5.60 | %
| $ | 2,482,652 |  |  | $ | 84,357 |  |  | $ | (1,016 | ) |  | $ | 2,565,993 |  |  | 5.04 | %
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, 2011, by length of time that individual securities in each category have been in a continuous loss position. The Company had no securities in a continuous loss position for 12 or more months at September 30, 2011, which consisted of mortgage-backed securities. Management believes that the declines in fair value of these investments are not an other than temporary impairment.
As of September 30, | 2011
| 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)
U.S. agency securities | $ | (325 | ) | $ | 9,675 |  | $ | — |  | $ | — |  | $ | (325 | ) | $ | 9,675 |
Agency pass-through certificates | — |  | — |  | — |  | — |  | — |  | — |
| $ | (325 | ) | $ | 9,675 |  | $ | — |  | $ | — |  | $ | (325 | ) | $ | 9,675 |

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