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Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Investment	Dec. 31, 2011 Investment
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	$ 422,196	$ 406,471
Number of securities with unrealized losses	79	80

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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