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Restricted Stock Activity (Detail) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock
   
Number of shares    
Nonvested at Beginning of year 59,196 77,085
Granted 31,312 29,978
Cancelled (25) (850)
Expired      
Vested/Released (21,527) (47,017)
Nonvested at end of year 68,956 59,196
Weighted average granted date fair value    
Nonvested at Beginning of year $ 5.71 $ 5.48
Granted $ 9.10 $ 6.98
Cancelled $ 3.05 $ 3.05
Expired      
Vested/Released $ 5.08 $ 6.13
Nonvested at end of year $ 6.87 $ 5.71