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Expected Amortization Schedule for Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Core Deposit Intangible
   
Finite-Lived Intangible Assets [Line Items]    
2012 $ 125  
2013 502  
2014 502  
2015 502  
2016 502  
Thereafter 503  
Total unamortized intangible 2,636 3,012
Trust Relationship Intangible
   
Finite-Lived Intangible Assets [Line Items]    
2012 19  
2013 75  
2014 75  
2015 75  
2016 75  
Thereafter 76  
Total unamortized intangible $ 395 $ 452