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Investments (Narrative) (Details)	6 Months Ended
	Jun. 30, 2012
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	9
S&P Rated AAA [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	2
S&P Rated AA [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	7
US Agency Obligations [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	5
Municipals [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	2
US Corporation [Member]
Schedule of Investments [Line Items]
Securities evaluated for other than temporary impairment	2

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Number of securities evaluated for other than temporary impairment.

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