Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE AND DIRECTOR BENEFITS - Additional Information (Detail)

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EMPLOYEE AND DIRECTOR BENEFITS - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation $ 788 $ 719    
Stock option exercise price per share $ 19.11 $ 17.34 $ 18.33 $ 15.65