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Municipal Bonds with and without Insurance (Detail) $ in Thousands	Jun. 30, 2015 USD ($)
Financial Statement Details [Line Items]
Ratings with insurance	$ 515
Ratings without insurance	515
AA Rating
Financial Statement Details [Line Items]
Ratings with insurance	515
BB Rating
Financial Statement Details [Line Items]
Ratings without insurance	$ 515

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Municipal Bonds Ratings With Insurance

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Municipal Bonds Ratings Without Insurance

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