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Municipal Bonds with and without Insurance (Detail) $ in Thousands | Sep. 30, 2015 USD ($)
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Financial Statement Details [Line Items] |
Ratings with insurance | $ 511
Ratings without insurance | 511
AA Rating |
Financial Statement Details [Line Items] |
Ratings with insurance | 511
BB Rating |
Financial Statement Details [Line Items] |
Ratings without insurance | $ 511

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