v2.4.0.6
Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets    
Investment securities available-for-sale $ 302,544 $ 322,512
Derivatives 1,841 1,349
Total 304,385 323,861
Liabilities    
Derivatives (1,841) (1,349)
Total 1,841 1,349
US Treasury and Government [Member]
   
Assets    
Investment securities available-for-sale 113,763 169,460
Residential Mortgage Backed Securities [Member]
   
Assets    
Investment securities available-for-sale 187,721 151,992
Corporate Securities [Member]
   
Assets    
Investment securities available-for-sale 1,060 1,060
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Assets    
Derivatives 0 0
Total 0 0
Liabilities    
Derivatives 0 0
Total 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | US Treasury and Government [Member]
   
Assets    
Investment securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Mortgage Backed Securities [Member]
   
Assets    
Investment securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Securities [Member]
   
Assets    
Investment securities available-for-sale 0 0
Significant Other Observable Inputs (Level 2) [Member]
   
Assets    
Derivatives 1,841 1,349
Total 303,325 322,801
Liabilities    
Derivatives (1,841) (1,349)
Total 1,841 1,349
Significant Other Observable Inputs (Level 2) [Member] | US Treasury and Government [Member]
   
Assets    
Investment securities available-for-sale 113,763 169,460
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member]
   
Assets    
Investment securities available-for-sale 187,721 151,992
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]
   
Assets    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) [Member]
   
Assets    
Derivatives 0 0
Total 1,060 1,060
Liabilities    
Derivatives 0 0
Total 0 0
Significant Unobservable Inputs (Level 3) [Member] | US Treasury and Government [Member]
   
Assets    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member]
   
Assets    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member]
   
Assets    
Investment securities available-for-sale $ 1,060 $ 1,060