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Investments (Narrative) (Details) | Mar. 31, 2013 security
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Schedule of Investments [Line Items] |
Securities evaluated for other than temporary impairment | 19
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 | 16
S&P Rated A [Member] |
Schedule of Investments [Line Items] |
Securities evaluated for other than temporary impairment | 1
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 | 12
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:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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