Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Additional Information (Detail)

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Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Net realized gain (loss) on redemption of investment securities $ 9,000 $ 1,000
Recognized in earnings resulting from the redemption of investment securities $ 34,000 $ 4,000