Quarterly report pursuant to Section 13 or 15(d)

Information for Restricted Stock Awards (Detail)

v2.4.0.6
Information for Restricted Stock Awards (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Restricted Stock at Beginning of Period 13,225 19,725
Number of Shares, Restricted Stock Vested    (6,500)
Number of Shares, Restricted Stock at End of Period 13,225 13,225
Weighted-Average Grant Date Fair Value Per Share, Restricted Stock at Beginning of Period $ 12.10 $ 11.87
Weighted-Average Grant Date Fair Value Per Share, Restricted Stock Vested   $ 10.75
Weighted-Average Grant Date Fair Value Per Share, Restricted Stock at End of Period $ 12.10 $ 12.10