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Investments Significant Assumptions in Determining Credit Loss Component of Other Than Temporary Impariment on Residential Mortgage Backed Securities (Details) (USD $) In Thousands, unless otherwise specified |  |  | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Minimum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Minimum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Maximum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Maximum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Minimum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Minimum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Maximum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Maximum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Minimum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Minimum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Maximum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Maximum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Securities | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Minimum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Minimum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Maximum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Maximum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Minimum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Minimum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Maximum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Maximum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2007 [Member] Minimum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2007 [Member] Minimum [Member] | Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2007 [Member] Maximum [Member] | Sep. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2007 [Member] Maximum [Member]
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |  |  |  |  |  |  |  |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate |  |  | 6.50% | 5.80% | 7.70% | 7.70% | 5.80% | 6.40% | 7.40% | 7.60% | 6.20% | 5.80% | 7.30% | 7.90% |  | 5.60% | 5.80% | 8.70% | 7.70% | 6.00% | 6.00% | 6.00% | 6.50% | 6.20% | 6.20% | 7.00% | 7.40%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate |  |  | 9.00% | 6.00% | 18.00% | 13.00% | 9.00% | 8.00% | 19.00% | 14.00% | 11.00% | 8.00% | 38.00% | 30.00% |  | 12.00% | 11.00% | 27.00% | 25.00% | 32.00% | 23.00% | 46.00% | 33.00% | 31.00% | 29.00% | 55.00% | 41.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity |  |  | 50.00% | 45.00% | 50.00% | 55.00% | 40.00% | 45.00% | 55.00% | 60.00% | 40.00% | 40.00% | 60.00% | 60.00% |  | 5.00% | 5.00% | 55.00% | 55.00% | 55.00% | 50.00% | 60.00% | 55.00% | 55.00% | 50.00% | 60.00% | 70.00%
Available-for-sale Debt Securities, Amortized Cost Basis | $ 20,136,014 | $ 16,980,279 |  |  |  |  |  |  |  |  |  |  |  |  | $ 389,900 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 380,900 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This item represents the discount rate on the underlying assets in the security that was considered as one of the potential factors in reaching a conclusion that the investments in marketable securities are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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- Definition This item represents the loss severity rate of the underlying assets in the security that was considered as one of the potential factors in reaching a conclusion that the investments in marketable securities are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References No definition available. + Details
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- Definition This item represents the cost of debt 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 No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph b(3) -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph b(3) -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 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition This item represents the default rate of the underlying assets in the security that was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18A -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. + Details
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