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Investments (Significant Assumptions Used to Determine the Credit Loss Component of Other Than Temporary Impariment on Residential Mortgage Backed Securities) (Details) - Residential Mortgage Backed Securities [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Prime Sector [Member] | Vintage Year 2005 [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	7.70%
Default rate	8.00%
Loss severity	50.00%
Prime Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	7.70%
Default rate	14.00%
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	12.00%	12.00%
Loss severity	40.00%	40.00%
Prime Sector [Member] | Vintage Year 2006 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	7.30%	7.40%
Default rate	13.00%	14.00%
Loss severity	50.00%	50.00%
Prime Sector [Member] | Vintage Year 2007 [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	6.20%	5.80%
Default rate	18.00%	15.00%
Loss severity	50.00%	45.00%
Prime Sector [Member] | Vintage Year 2007 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	6.40%	7.00%
Default rate	31.00%	25.00%
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	7.40%	5.60%
Default rate	11.00%	13.00%
Loss severity	60.00%	2.00%
Alt-A Sector [Member] | Vintage Year 2005 [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Discount rate	7.40%	7.40%
Default rate	11.00%	99.00%
Loss severity	60.00%	50.00%

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=73527792&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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