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Note 3 - Loans and Allowance for Loan Losses (Detail) - Allowance for Loan Losses and the Recorded Investment of Loans (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Ending allowance balance attributable to loans:      
Individually evaluated for impairment $ 2,107 $ 655  
Collectively evaluated for impairment 4,798 6,689  
Total ending allowance balance     8,198
Loans:      
Loans individually evaluated for impairment 17,401 11,572  
Loans collectively evaluated for impairment 540,887 586,736  
Total ending loans balance 558,288 598,308  
Residential Portfolio Segment [Member] | Evaluated for Impairment [Member]
     
Loans:      
Total ending loans balance 226,022 238,490  
Residential Portfolio Segment [Member] | Allowance for Loan and Lease Losses [Member]
     
Ending allowance balance attributable to loans:      
Total ending allowance balance 1,329 1,860  
Residential Portfolio Segment [Member]
     
Ending allowance balance attributable to loans:      
Individually evaluated for impairment 128 130  
Collectively evaluated for impairment 1,201 1,730  
Loans:      
Loans individually evaluated for impairment 827 1,505  
Loans collectively evaluated for impairment 225,195 236,985  
Total ending loans balance 226,022 238,490  
Commercial Real Estate Portfolio Segment [Member] | Evaluated for Impairment [Member]
     
Loans:      
Total ending loans balance 175,010 207,455  
Commercial Real Estate Portfolio Segment [Member] | Allowance for Loan and Lease Losses [Member]
     
Ending allowance balance attributable to loans:      
Total ending allowance balance 3,946 3,493  
Commercial Real Estate Portfolio Segment [Member]
     
Ending allowance balance attributable to loans:      
Individually evaluated for impairment 1,979 525  
Collectively evaluated for impairment 1,967 2,968  
Loans:      
Loans individually evaluated for impairment 16,354 9,733  
Loans collectively evaluated for impairment 158,656 197,722  
Commercial and Industrial [Member] | Evaluated for Impairment [Member]
     
Loans:      
Total ending loans balance 57,239 45,200  
Commercial and Industrial [Member] | Allowance for Loan and Lease Losses [Member]
     
Ending allowance balance attributable to loans:      
Total ending allowance balance 783 636  
Commercial and Industrial [Member]
     
Ending allowance balance attributable to loans:      
Collectively evaluated for impairment 783 636  
Loans:      
Loans individually evaluated for impairment   334  
Loans collectively evaluated for impairment 57,239 44,866  
Total ending loans balance 57,239 45,200  
Consumer Portfolio Segment [Member] | Evaluated for Impairment [Member]
     
Loans:      
Total ending loans balance 100,017 107,163  
Consumer Portfolio Segment [Member] | Allowance for Loan and Lease Losses [Member]
     
Ending allowance balance attributable to loans:      
Total ending allowance balance 847 1,355  
Consumer Portfolio Segment [Member]
     
Ending allowance balance attributable to loans:      
Collectively evaluated for impairment 847 1,355  
Loans:      
Loans individually evaluated for impairment 220    
Loans collectively evaluated for impairment 99,797 107,163  
Evaluated for Impairment [Member]
     
Loans:      
Total ending loans balance 558,288 598,308  
Allowance for Loan and Lease Losses [Member]
     
Ending allowance balance attributable to loans:      
Total ending allowance balance $ 6,905 $ 7,344