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Note 9 - Revenue From Contracts With Customers (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
    2018   2017   2018   2017
    (In thousands)
                 
Service charges on deposit accounts   $
1,198
    $
1,155
    $
3,495
    $
3,288
 
Investment advisory income    
84
     
106
     
302
     
351
 
Other    
10
     
9
     
31
     
29
 
Revenue from contracts with customers    
1,292
     
1,270
     
3,828
     
3,668
 
                                 
Gain on sale of loans and securities    
320
     
410
     
755
     
1,082
 
Increase in cash value of life insurance    
51
     
41
     
179
     
154
 
Other    
35
     
27
     
198
     
153
 
Other noninterest income    
406
     
478
     
1,132
     
1,389
 
                                 
Total noninterest income   $
1,698
    $
1,748
    $
4,960
    $
5,057