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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			6 Months Ended													6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Minimum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Minimum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Maximum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2005 [Member] Maximum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Minimum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Minimum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Maximum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2006 [Member] Maximum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Minimum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Minimum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Maximum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Prime Sector [Member] Vintage Year 2007 [Member] Maximum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Securities	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Minimum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Minimum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Maximum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2005 [Member] Maximum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Minimum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Minimum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Maximum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2006 [Member] Maximum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2007 [Member] Minimum [Member]	Jun. 30, 2011 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2007 [Member] Minimum [Member]	Jun. 30, 2012 Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities, Alt-A Sector [Member] Vintage Year 2007 [Member] Maximum [Member]	Jun. 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, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate			9.00%	8.00%	13.00%	8.00%	9.00%	9.00%	19.00%	11.00%	11.00%	8.00%	38.00%	30.00%		12.00%	13.00%	27.00%	24.00%	32.00%	30.00%	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%	50.00%	50.00%	50.00%	40.00%	50.00%	55.00%	55.00%	40.00%	40.00%	60.00%	60.00%		5.00%	5.00%	50.00%	55.00%	55.00%	50.00%	60.00%	50.00%	55.00%	50.00%	60.00%	70.00%
Other Than Temporary Impairment Losses, Available for Sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Discount Rate			6.50%	7.70%	7.70%	7.70%	5.80%	7.30%	7.40%	7.30%	6.20%	5.80%	7.30%	7.30%		5.60%	6.00%	7.70%	7.70%	6.00%	6.00%	6.00%	6.50%	6.20%	6.20%	7.00%	7.40%
Available-for-sale Debt Securities, Amortized Cost Basis	$ 19,083,027	$ 16,980,279													$ 405,000
Available-for-sale Securities, Fair Value Disclosure															$ 386,500

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.

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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.

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