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Investments (Narrative) (Details) | 6 Months Ended
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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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- Definition Number of securities evaluated for other than temporary impairment. + References No definition available. + Details
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Namespace Prefix: | cik0001275101_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration