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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]        
Net realized gain (loss) on redemption or sale of investment securities $ 611,000 $ 10,000 $ 923,000 $ 1,392,000
Recognized in earnings resulting from the redemption of investment securities 899,000 4,000 2,400,000 1,700,000
Gain (loss) on Reclassification from other comprehensive loss to OTTI charge in earnings   $ 176,000   $ 176,000