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Investments (Narrative) (Details)	9 Months Ended
	Sep. 30, 2012 security
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	4
S&P Rated AAA [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	1
S&P Rated AA [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	3
US Agency Obligations [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	1
Municipals [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	3

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Number of securities evaluated for other than temporary impairment.

+ References

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