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Note 7 - Loans And Related Allowance For Loan Losses (Detail) - Impaired Loans by Class (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
With no related allowance recorded:    
Impaired loans with no related allowance recorded investment $ 7,992 $ 8,408
Impaired loans with no related allowance unpaid principal balance 8,105 8,441
With an allowance recorded:    
Impaired loans with related allowance recorded investment 11,247 12,880
Impaired loans with related allowance unpaid principal balance 11,286 12,899
Impaired loans, related allowance 2,876 3,688
Total:    
Impaired loans recorded investment 19,239 21,288
Impaired loans unpaid principal balance 19,391 21,340
Impaired loans, related allowance 2,876 3,688
Commercial and Industrial [Member]
   
With no related allowance recorded:    
Impaired loans with no related allowance recorded investment 1,271 1,230
Impaired loans with no related allowance unpaid principal balance 1,271 1,229
With an allowance recorded:    
Impaired loans with related allowance recorded investment 1,704  
Impaired loans with related allowance unpaid principal balance 1,704  
Impaired loans, related allowance 700 1,189
Total:    
Impaired loans recorded investment 2,975 4,592
Impaired loans unpaid principal balance 2,975 4,596
Impaired loans, related allowance 700 1,189
Real Estate Construction [Member]
   
With no related allowance recorded:    
Impaired loans with no related allowance recorded investment 322 308
Impaired loans with no related allowance unpaid principal balance 322 308
With an allowance recorded:    
Impaired loans with related allowance recorded investment 3,450 3,685
Impaired loans with related allowance unpaid principal balance 3,450 3,685
Impaired loans, related allowance 790 933
Total:    
Impaired loans recorded investment 3,772 3,993
Impaired loans unpaid principal balance 3,772 3,993
Impaired loans, related allowance 790 933
Residential Real Estate Mortgage [Member]
   
With no related allowance recorded:    
Impaired loans with no related allowance recorded investment 2,617 2,716
Impaired loans with no related allowance unpaid principal balance 2,730 2,729
With an allowance recorded:    
Impaired loans with related allowance recorded investment 3,025 3,045
Impaired loans with related allowance unpaid principal balance 3,064 3,054
Impaired loans, related allowance 703 600
Total:    
Impaired loans recorded investment 5,642 5,761
Impaired loans unpaid principal balance 5,794 5,783
Impaired loans, related allowance 703 600
Commercial Real Estate Mortgage [Member]
   
With no related allowance recorded:    
Impaired loans with no related allowance recorded investment 3,772 4,143
Impaired loans with no related allowance unpaid principal balance 3,772 4,164
With an allowance recorded:    
Impaired loans with related allowance recorded investment 3,060 2,771
Impaired loans with related allowance unpaid principal balance 3,060 2,776
Impaired loans, related allowance 682 960
Total:    
Impaired loans recorded investment 6,832 6,914
Impaired loans unpaid principal balance 6,832 6,940
Impaired loans, related allowance 682 960
Consumer Installment [Member]
   
With no related allowance recorded:    
Impaired loans with no related allowance recorded investment 10 11
Impaired loans with no related allowance unpaid principal balance 10 11
With an allowance recorded:    
Impaired loans with related allowance recorded investment 8 17
Impaired loans with related allowance unpaid principal balance 8 17
Impaired loans, related allowance 1 6
Total:    
Impaired loans recorded investment 18 28
Impaired loans unpaid principal balance 18 28
Impaired loans, related allowance 1 6
Commercial and Industrial [Member]
   
With an allowance recorded:    
Impaired loans with related allowance recorded investment   3,362
Impaired loans with related allowance unpaid principal balance   3,367
Impaired loans, related allowance   1,189
Total:    
Impaired loans, related allowance   $ 1,189