Net Carrying Value and Estimated Fair Value of Debt and Equity Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Amortized Cost
Due in one year or less	$ 2,804
Due after one year through three years
Due after three years
Total investment securities	2,804
Estimated Fair Value
Due in one year or less	2,804
Due after one year through three years
Due after three years
Total investment securities	$ 2,804

Available for sale securities debt maturities after one year through three years amortized cost basis.

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- Definition

Available-for-sale securities, debt maturities, after three years, amortized cost basis.

+ References

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- Definition

Available-for-sale securities, debt maturities, after three years, fair value.

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- Definition

Available for sale securities debt maturities due after one year through three years fair value.

+ References

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

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Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

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