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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])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
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		13.00%
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	11.00%	8.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	40.00%	40.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	6.10%	5.80%
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%	8.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	40.00%	45.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	5.80%	6.40%
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%	6.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	40.00%	40.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	6.50%	5.80%
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	31.00%	29.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	55.00%	50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	6.20%	6.20%
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	32.00%	23.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	55.00%	50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	6.00%	6.00%
Minimum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2004 [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	11.00%	11.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	60.00%	50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	5.80%	5.80%
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	12.00%	11.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	5.00%	5.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	5.60%	5.70%
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		13.00%
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	38.00%	30.00%
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	7.30%	7.90%
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	19.00%	15.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	55.00%	60.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	7.60%	7.60%
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	19.00%	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	7.70%	7.90%
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	55.00%	59.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	65.00%	70.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	7.00%	7.40%
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%	47.00%
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	6.00%	7.30%
Maximum [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] | Vintage Year 2004 [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	11.00%	11.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	60.00%	50.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	5.80%	5.80%
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	38.00%	32.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Loss Severity	55.00%	55.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate	8.70%	7.70%

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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X

- 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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- 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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