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Investments (Significant Assumptions in Determining Credit Loss Component of Other Than Temporary Impairment on Residential Mortgage Backed Securities) (Details) - Residential Mortgage Backed Securities [Member]	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Prime Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate		7.50%
Default rate		15.00%
Loss severity		50.00%
Prime Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate		7.50%
Default rate		15.00%
Loss severity		50.00%
Prime Sector [Member] | Vintage Year 2006 [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	6.50%	6.50%
Default rate	14.00%	11.00%
Loss severity	40.00%	50.00%
Prime Sector [Member] | Vintage Year 2006 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	6.50%	7.40%
Default rate	14.00%	12.00%
Loss severity	40.00%	50.00%
Prime Sector [Member] | Vintage Year 2007 [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	5.80%	7.00%
Default rate	15.00%	14.00%
Loss severity	45.00%	55.00%
Prime Sector [Member] | Vintage Year 2007 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	7.00%	7.00%
Default rate	21.00%	14.00%
Loss severity	55.00%	55.00%
Alt-A Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	5.60%	5.60%
Default rate	99.00%	87.00%
Loss severity	2.00%	2.00%
Alt-A Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	5.60%	6.40%
Default rate	99.00%	89.00%
Loss severity	2.00%	2.00%

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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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 Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 8A



-Subparagraph a.1.



-URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284381-111563

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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