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Investment Securities (Details) (USD $) | 12 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 3,119,510,000 | $ 2,402,545,000 |
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract] |  |  |
Available-for-sale Securities, Gross Unrealized Gains | 135,959,000 | 79,564,000 |
Available-for-sale Securities, Gross Unrealized Losses | (325,000) | (1,016,000) |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Available-for-sale Securities | 3,255,144,000 | 2,481,093,000 |
Investment Yield [Abstract] |  |  |
Available-for-sale Securities, Yield | 4.62% | 5.02% |
Held-to-maturity Securities, Yield | 5.33% | 5.60% |
Held-to-maturity Securities, Debt Maturities [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount | 47,036,000 | 80,107,000 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |
Gross Unrecognized Holding Gains, After One Through Five Years |  | 0 |
Held-to-maturity Securities, Unrecognized Holding Gain | 3,580,000 | 4,793,000 |
Unrecognized Holding Losses, After One Year Through Five Years |  | 0 |
Held-to-maturity Securities, Unrecognized Holding Loss | 0 | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value | 50,616,000 | 84,900,000 |
Investments | 3,166,546,000 | 2,482,652,000 |
Gross Unrealized Gains on Investments | 139,539,000 | 84,357,000 |
Gross Unrealized Losses on Investments | (325,000) | (1,016,000) |
Investments, Fair Value Disclosure | 3,305,760,000 | 2,565,993,000 |
Yield | 4.63% | 5.04% |
Proceeds from Sale of Available-for-sale Securities, Debt | 131,361,000 | 496,024,000 | 18,453,000
Mortgage Backed Securities, Debt Maturity, Date Range Low | 10 years |  |
Gain (Loss) on Sale of Securities, Net | 8,147,000 | 22,409,000 | 1,063,000
Municipal Bonds [Member] |  |  |
Investment Yield [Abstract] |  |  |
Yield, After One Through Five Years | 6.52% | 6.11% |
Yield, After Five Through Ten Years | 5.60% | 5.67% |
Yield, After Ten Years | 0.00% | 5.60% |
Held-to-maturity Securities, Debt Maturities [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 405,000 | 1,105,000 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 1,545,000 | 1,940,000 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | 0 | 4,010,000 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | 0 | 4,044,000 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |
Gross Unrecognized Holding Gains, After One Through Five Years | 5,000 | 65,000 |
Gross Unrecognized Holding Gains, After Five Years Through Ten Years | 68,000 | 115,000 |
Gross Unrecognized Holding Gains, After Ten Years | 0 | 34,000 |
Gross Unrecognized Holding Losses, After Five Through Ten Years | 0 | 0 |
Unrecognized Holding Losses, After One Year Through Five Years | 0 | 0 |
Gross Unrecognized Holding Losses, After Ten Years | 0 | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value | 410,000 | 1,170,000 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 1,613,000 | 2,055,000 |
Municipal Bonds [Member] |  |  |
Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 20,461,000 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract] |  |  |
Gross Unrealized Gains, After Ten Years | 3,107,000 |  |
Gross Unrealized Losses, Over Ten Years | 0 |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 23,568,000 |  |
Investment Yield [Abstract] |  |  |
Yield, After Ten Years | 6.45% |  |
US Treasury and Government [Member] |  |  |
Investment Yield [Abstract] |  |  |
Yield, After One Through Five Years | 0.00% | 0.00% |
Held-to-maturity Securities, Debt Maturities [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 0 | 0 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |
Gross Unrecognized Holding Gains, After One Through Five Years | 0 |  |
Unrecognized Holding Losses, After One Year Through Five Years | 0 |  |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 | 0 |
US Treasury and Government [Member] |  |  |
Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis | 500,000 | 500,000 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis | 0 | 25,000,000 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 9,300,000 | 158,915,000 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 175,515,000 | 150,000,000 |
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract] |  |  |
Gross Unrealized Gains, Within One Year | 34,000 | 26,000 |
Gross Unrealized Gains After One Through Five Years | 0 | 180,000 |
Gross Unrealized Gains, After Five Through Ten Years | 4,547,000 | 5,344,000 |
Gross Unrealized Gains, After Ten Years | 631,000 | 1,161,000 |
Gross Unrealized Losses, Within One Year | 0 | 0 |
Gross Unrealized Losses, After One Through Five Years | 0 | 0 |
Gross Unrealized Losses, After Five Years Through Ten Years | 0 | (105,000) |
Gross Unrealized Losses, Over Ten Years | 0 | (15,000) |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 534,000 | 526,000 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 | 25,180,000 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 13,847,000 | 164,154,000 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 176,146,000 | 151,146,000 |
Investment Yield [Abstract] |  |  |
Yield, Within One Year | 4.00% | 4.00% |
Yield, After One Through Five Years | 0.00% | 3.25% |
Yield, After Five Through Ten Years | 10.38% | 3.59% |
Yield, After Ten Years | 2.57% | 3.50% |
Agency Pass-Through Certificates |  |  |
Investment Yield [Abstract] |  |  |
Yield, Without Single Maturity | 5.31% | 5.59% |
Held-to-maturity Securities, Debt Maturities [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 45,086,000 | 73,052,000 |
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract] |  |  |
Gross Unrecognized Gains Without Single Maturity | 3,507,000 | 4,579,000 |
Gross Unrecognized Losses Without Single Maturity | 0 | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | 48,593,000 | 77,631,000 |
Agency Pass-Through Certificates |  |  |
Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 2,883,734,000 | 2,058,130,000 |
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract] |  |  |
Gross Unrealized Gains Without Single Maturity | 127,356,000 | 72,853,000 |
Gross Unrealized Losses Without Single Maturity | 0 | (896,000) |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 3,011,090,000 | 2,130,087,000 |
Investment Yield [Abstract] |  |  |
Yield, Without Single Maturity | 4.72% | 5.26% |
Corporate Debt Securities [Member] |  |  |
Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 30,000,000 | 10,000,000 |
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract] |  |  |
Gross Unrealized Gains, After Five Through Ten Years | 284,000 | 0 |
Gross Unrealized Losses, After Five Years Through Ten Years | (325,000) | 0 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | $ 29,959,000 | $ 10,000,000 |
Investment Yield [Abstract] |  |  |
Yield, After Five Through Ten Years | 4.00% | 6.00% |

X
- Definition For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 115 -Paragraph 19 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 115 -Paragraph 20 -Subparagraph c -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph c -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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition This item represents the fair value of debt securities which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 115 -Paragraph 20 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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