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Municipal Bonds with and without Insurance (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
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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Municipal Bonds Ratings With Insurance

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Municipal Bonds Ratings Without Insurance

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