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Investment Securities (Tables) | 12 Months Ended
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Sep. 30, 2012
Investment Securities [Abstract] |
Investments by contractual maturity date |
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 | %
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 |  |  |  |  |  |  |  |  |
1 to 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Within 1 year |  |  |  |  |  |  |  |  |  |  |  |  | — | %
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 | %
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, 2012, by length of time that individual securities in each category have been in a continuous loss position. The Company had $10.0 million securities in a continuous loss position for 12 or more months at September 30, 2012, 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, | 2012
| 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 | $ | (61 | ) | $ | 14,939 |  | $ | (7 | ) | $ | 9,994 |  | $ | (68 | ) | $ | 24,933 |
U.S. agency securities | (6 | ) | 19,493 |  | — |  | — |  | (6 | ) | 19,493 |
Agency pass-through certificates | (1,050 | ) | 201,749 |  | — |  | — |  | (1,050 | ) | 201,749 |
| $ | (1,117 | ) | $ | 236,181 |  | $ | (7 | ) | $ | 9,994 |  | $ | (1,124 | ) | $ | 246,175 |

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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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