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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 securities	Dec. 31, 2011 securities
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities	$ 150,197	$ 137,388
Number of securities	12	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	$ (338)	$ (337)

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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