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Note 7 - Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
 
 
 
  
December 31, 2017
    
 
 
 
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
 
 
 
  
Unrealized
    
Unrealized
    
 
 
 
   
Amortized
    
Holding
    
Holding
    
Fair
  
(In Thousands)
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
Obligations of U.S. Government agencies
   $
8,026
     $
0
     $
(153
 )   $
7,873
  
Obligations of states and political subdivisions:
                                
Tax-exempt
    
103,673
      
2,291
      
(853
 )    
105,111
  
Taxable
    
25,431
      
226
      
(84
 )    
25,573
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                
Residential pass-through securities
    
52,992
      
79
      
(724
 )    
52,347
  
Residential collateralized mortgage obligations
    
134,314
      
110
      
(2,610
 )    
131,814
  
Commercial mortgage-backed securities
    
33,881
      
4
      
(666
 )    
33,219
  
Total debt securities
    
358,317
      
2,710
      
(5,090
 )    
355,937
  
Marketable equity securities
    
1,000
      
0
      
(29
 )    
971
  
Total
   $
359,317
     $
2,710
     $
(5,119
 )   $
356,908
  
   
 
 
 
  
December 31, 2016
    
 
 
 
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
 
 
 
  
Unrealized
    
Unrealized
    
 
 
 
   
Amortized
    
Holding
    
Holding
    
Fair
  
(In Thousands)
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
Obligations of U.S. Government agencies
   $
9,671
     $
5
     $
(135
 )   $
9,541
  
Obligations of states and political subdivisions:
                                
Tax-exempt
    
118,140
      
2,592
      
(1,695
 )    
119,037
  
Taxable
    
30,073
      
303
      
(79
 )    
30,297
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                
Residential pass-through securities
    
58,922
      
306
      
(824
 )    
58,404
  
Residential collateralized mortgage obligations
    
147,915
      
408
      
(1,715
 )    
146,608
  
Commercial mortgage-backed securities
    
30,817
      
0
      
(598
 )    
30,219
  
Total debt securities
    
395,538
      
3,614
      
(5,046
 )    
394,106
  
Marketable equity securities
    
1,000
      
0
      
(29
 )    
971
  
Total
   $
396,538
     $
3,614
     $
(5,075
 )   $
395,077
  
Schedule of Unrealized Loss on Investments [Table Text Block]
December 31, 2017
  
Less Than 12 Months
    
12 Months or More
    
Total
  
(In Thousands)
  
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
                                                 
Obligations of U.S. Government agencies
   $
0
     $
0
     $
7,873
     $
(153
 )   $
7,873
     $
(153
 )
Obligations of states and political subdivisions:
                                                
Tax-exempt
    
19,050
      
(135
 )    
24,391
      
(718
 )    
43,441
      
(853
 )
Taxable
    
9,279
      
(45
 )    
2,116
      
(39
 )    
11,395
      
(84
 )
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                                
Residential pass-through securities
    
25,255
      
(242
 )    
22,549
      
(482
 )    
47,804
      
(724
 )
Residential collateralized mortgage obligations
    
50,812
      
(589
 )    
68,558
      
(2,021
 )    
119,370
      
(2,610
 )
Commercial mortgage-backed securities
    
14,713
      
(173
 )    
14,569
      
(493
 )    
29,282
      
(666
 )
Total debt securities
    
119,109
      
(1,184
 )    
140,056
      
(3,906
 )    
259,165
      
(5,090
 )
Marketable equity securities
    
0
      
0
      
971
      
(29
 )    
971
      
(29
 )
Total temporarily impaired available-for-sale securities
   $
119,109
     $
(1,184
 )   $
141,027
     $
(3,935
 )   $
260,136
     $
(5,119
 )
December 31, 2016
  
Less Than 12 Months
    
12 Months or More
    
Total
  
(In Thousands)
  
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
                                                 
Obligations of U.S. Government agencies
   $
7,899
     $
(135
 )   $
0
     $
0
     $
7,899
     $
(135
 )
Obligations of states and political subdivisions:
                                                
Tax-exempt
    
54,479
      
(1,676
 )    
1,278
      
(19
 )    
55,757
      
(1,695
 )
Taxable
    
9,594
      
(79
 )    
0
      
0
      
9,594
      
(79
 )
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                                
Residential pass-through securities
    
48,674
      
(824
 )    
0
      
0
      
48,674
      
(824
 )
Residential collateralized mortgage obligations
    
85,198
      
(1,124
 )    
16,073
      
(591
 )    
101,271
      
(1,715
 )
Commercial mortgage-backed securities
    
30,219
      
(598
 )    
0
      
0
      
30,219
      
(598
 )
Total debt securities
    
236,063
      
(4,436
 )    
17,351
      
(610
 )    
253,414
      
(5,046
 )
Marketable equity securities
    
1,000
      
(29
 )    
0
      
0
      
1,000
      
(29
 )
Total temporarily impaired available-for-sale securities
   $
237,063
     $
(4,465
 )   $
17,351
     $
(610
 )   $
254,414
     $
(5,075
 )
Realized Gain (Loss) on Investments [Table Text Block]
(In Thousands)
 
 
 
 
  
 
 
 
  
 
 
 
   
2017
    
2016
    
2015
  
Gross realized gains from sales
   $
315
     $
1,392
     $
2,972
  
Gross realized losses from sales
    
(58
 )    
(234
 )    
(111
 )
Net realized gains
   $
257
     $
1,158
     $
2,861
  
Income tax provision related to net realized gains
   $
89
     $
406
     $
1,002
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
December 31, 2017
  
   
Amortized
    
Fair
  
(In Thousands)
  
Cost
    
Value
  
                 
Due in one year or less
   $
11,350
     $
11,347
  
Due from one year through five years
    
69,274
      
70,016
  
Due from five years through ten years
    
37,086
      
37,089
  
Due after ten years
    
19,420
      
20,105
  
Sub
-total
    
137,130
      
138,557
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                
Residential pass-through securities
    
52,992
      
52,347
  
Residential collateralized mortgage obligations
    
134,314
      
131,814
  
Commercial mortgage-backed securities
    
33,881
      
33,219
  
Total
   $
358,317
     $
355,937