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Note 7 - Loans And Related Allowance For Loan Losses (Detail) - Additional Information on Impaired Loans (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Commercial and Industrial [Member]
   
Total:    
Impaired loans, average recorded investment $ 2,975 $ 1,781
Impaired loans, interest income recognized 55 12
Real Estate Construction [Member]
   
Total:    
Impaired loans, average recorded investment 3,772 471
Impaired loans, interest income recognized 37 1
Residential Real Estate Mortgage [Member]
   
Total:    
Impaired loans, average recorded investment 5,642 2,809
Impaired loans, interest income recognized 74 27
Commercial Real Estate Mortgage [Member]
   
Total:    
Impaired loans, average recorded investment 6,832 1,884
Impaired loans, interest income recognized 110 26
Consumer Installment [Member]
   
Total:    
Impaired loans, average recorded investment 18 28
Impaired loans, interest income recognized   $ 1