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Note 3 - Loans and Allowance for Loan Losses (Detail) - TDR's Pre-Modification and Post-Modification (Performing to Modified Terms [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Owner-occupied    
Pre-Modification of Recorded Investment $ 10,936 $ 1,585
Post-Modification of Recorded Investment 10,877 1,487
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Owner Occupied [Member]
    
Owner-occupied    
Pre-Modification of Recorded Investment 4,266  
Post-Modification of Recorded Investment 4,222  
Reduction of Principal and Interest Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]
    
Owner-occupied    
Pre-Modification of Recorded Investment 686  
Post-Modification of Recorded Investment 671  
Interest Only Payments [Member] | Commercial Real Estate Nonowner Occupied [Member]
    
Owner-occupied    
Pre-Modification of Recorded Investment 5,984 400
Post-Modification of Recorded Investment 5,984 400
Rate Reduction [Member] | Commercial Real Estate Owner Occupied [Member]
    
Owner-occupied    
Pre-Modification of Recorded Investment   959
Post-Modification of Recorded Investment   868
Maturity Extension at Lower Stated Rate Than Market Rate [Member] | Commercial Real Estate Owner Occupied [Member]
    
Owner-occupied    
Pre-Modification of Recorded Investment   226
Post-Modification of Recorded Investment   $ 219