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Investments Significant Assumptions in Determining Credit Loss Component of Other Than Temporary Impariment on Residential Mortgage Backed Securities (Details) (Residential Mortgage Backed Securities [Member]) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Minimum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2008 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 16.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 45.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.60% |
Minimum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2007 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 14.00% | 15.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 40.00% | 50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.50% | 6.40%
Minimum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2006 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 9.00% | 19.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 50.00% | 50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.00% | 6.90%
Minimum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2005 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 8.00% | 13.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 50.00% | 50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.50% | 7.50%
Minimum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2003 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 2.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 30.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 5.10% |
Minimum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 15.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 5.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 5.60% |
Minimum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2007 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 38.00% | 42.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 60.00% | 55.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.20% | 6.60%
Minimum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2006 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate |  | 46.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity |  | 55.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate |  | 6.00%
Minimum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2005 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate |  | 14.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity |  | 5.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate |  | 6.40%
Maximum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2008 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 16.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 45.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.60% |
Maximum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2007 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 25.00% | 38.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 60.00% | 60.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.70% | 7.30%
Maximum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2006 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 16.00% | 19.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 50.00% | 55.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.90% | 7.40%
Maximum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2005 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 17.00% | 13.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 50.00% | 50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 7.70% | 7.50%
Maximum [Member] | Residential Mortgage Backed Securities, Prime Sector [Member] | Vintage Year 2003 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 2.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 30.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 5.10% |
Maximum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 25.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 65.00% |
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 8.70% |
Maximum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2007 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate | 52.00% | 55.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity | 65.00% | 60.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate | 6.90% | 7.00%
Maximum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2006 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate |  | 46.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity |  | 55.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate |  | 6.00%
Maximum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2005 [Member] |  |
Residential Mortgage Backed Securities, Vintage Year [Line Items] |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate |  | 27.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity |  | 50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate |  | 7.40%

X
- 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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X
- 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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