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Note 14 - Commitments and Off-balance Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure Text Block Supplement [Abstract]  
Summary of Contractual Amounts of Financial Instruments with Off-balance Sheet Risk [Table Text Block]
   

2015

    

2014

  
             

Commercial unused lines of credit

   $ 522,658,000     $ 554,856,000  

Unused lines of credit secured by 1 – 4 family residential properties

     61,905,000       60,983,000  

Credit card unused lines of credit

     15,612,000       11,649,000  

Other consumer unused lines of credit

     8,583,000       8,673,000  

Commitments to make loans

     178,034,000       110,126,000  

Standby letters of credit

     34,946,000       35,461,000  
                 

Total commitments

   $ 821,738,000     $ 781,748,000  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
    2015      2014   
    Contract      Carrying      Contract      Carrying  
    Amount      Value     Amount     Value   
                         

Standby letters of credit

  $ 34,946,000     $ 182,000     $ 35,461,000     $ 150,000