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Note 17 - Off-balance Sheet Arrangements and Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Financial Instruments With Off Balance Sheet Credit Risk [Table Text Block]
   
201
7
    
2016
  
                 
Commitments to extend or originate loans
   $
40,410
     $
80,265
  
Rate lock agreements with customers
    
6,627
      
14,079
  
Funded mortgage loans committed to sell
    
3,815
      
8,954
  
Unadvanced portion of construction loans
    
48,459
      
75,365
  
Unused lines of credit
    
134,781
      
132,796
  
Standby letters of credit
    
3,659
      
2,870
  
Overdraft protection limits
    
15,886
      
16,585