Quarterly report pursuant to Section 13 or 15(d)

Summary of Share Activity Related to Restricted Stock (Detail)

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Summary of Share Activity Related to Restricted Stock (Detail) (Restricted Stock, USD $)
9 Months Ended
Sep. 30, 2013
Restricted Stock
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares, Nonvested, beginning of period 43,687
Shares, Granted 27,450
Shares, Vested (27,297)
Shares, Nonvested, end of period 43,840
Weighted Average Grant Date Value Per Share, Beginning of period $ 18.69
Weighted Average Grant Date Fair Value Per Share, Granted $ 12.75
Weighted Average Grant Date Fair Value Per Share, Vested $ 17.09
Weighted Average Grant Date Value Per Share, End of period $ 15.96