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Municipal Bonds with and without Insurance (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Financial Statement Details [Line Items]
Ratings with insurance	$ 3,558
Ratings without insurance	3,558
AAA Rating
Financial Statement Details [Line Items]
Ratings with insurance	1,258
AA Rating
Financial Statement Details [Line Items]
Ratings without insurance	1,258
A Rating
Financial Statement Details [Line Items]
Ratings with insurance	2,300
Ratings without insurance	$ 2,300

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Municipal Bonds Ratings With Insurance

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Municipal Bonds Ratings Without Insurance

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