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Fair Value Measurement - Additional Information (Detail)	Dec. 31, 2012 Securities	Dec. 31, 2011 Securities
Fair Value Measurements Disclosure [Line Items]
Number of securities in unrealized loss position	16	38
Number of securities	38	44

Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity 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 held-to-maturity investments determined to be temporarily impaired.

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