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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]        
Net realized gain (loss) on redemption of investment securities $ 303,000 $ 1,381,000 $ 312,000 $ 1,382,000
Recognized in earnings resulting from the redemption of investment securities $ 812,000 $ 1,900,000 $ 856,000 $ 1,700,000