Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Additional Information (Detail)

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Investment Securities - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]          
Investment securities, contractual maturity     2042    
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  
Investment securities available-for- sale, carrying values     $ 55,700,000   $ 18,200,000