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Note 6 - Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
 
 
 
  
September
30
, 2018
    
 
 
 
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
 
 
 
  
Unrealized
    
Unrealized
    
 
 
 
   
Amortized
    
Holding
    
Holding
    
Fair
  
(In Thousands)
  
Cost
    
Gains
    
Losses
    
Value
  
                                 
Obligations of U.S. Government agencies
   $
4,815
     $
0
     $
(47
 )   $
4,768
  
Obligations of states and political subdivisions:
                                
Tax-exempt
    
92,837
      
1,104
      
(2,229
 )    
91,712
  
Taxable
    
27,975
      
21
      
(354
 )    
27,642
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                
Residential pass-through securities
    
57,279
      
46
      
(2,194
 )    
55,131
  
Residential collateralized mortgage obligations
    
148,074
      
8
      
(5,451
 )    
142,631
  
Commercial mortgage-backed securities
    
38,488
      
0
      
(1,666
 )    
36,822
  
Total available-for-sale-debt securities
   $
369,468
     $
1,179
     $
(11,941
 )   $
358,706
  
   
 
 
 
  
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 available-for-sale debt securities
   $
358,317
     $
2,710
     $
(5,090
 )   $
355,937
  
Schedule of Unrealized Loss on Investments [Table Text Block]
September
3
0
, 2018
  
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
   $
4,768
     $
(47
 )   $
0
     $
0
     $
4,768
     $
(47
 )
Obligations of states and political subdivisions:
                                                
Tax-exempt
    
25,713
      
(465
 )    
28,785
      
(1,764
 )    
54,498
      
(2,229
 )
Taxable
    
16,635
      
(200
 )    
5,362
      
(154
 )    
21,997
      
(354
 )
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                                                
Residential pass-through securities
    
13,528
      
(178
 )    
40,904
      
(2,016
 )    
54,432
      
(2,194
 )
Residential collateralized mortgage obligations
    
53,399
      
(884
 )    
87,703
      
(4,567
 )    
141,102
      
(5,451
 )
Commercial mortgage-backed securities
    
8,798
      
(147
 )    
28,024
      
(1,519
 )    
36,822
      
(1,666
 )
Total temporarily impaired available-for-sale debt securities
   $
122,841
     $
(1,921
 )   $
190,778
     $
(10,020
 )   $
313,619
     $
(11,941
 )
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 temporarily impaired available-for-sale debt securities
   $
119,109
     $
(1,184
 )   $
140,056
     $
(3,906
 )   $
259,165
     $
(5,090
 )
Realized Gain (Loss) on Investments [Table Text Block]
(In Thousands)
 
3 Months Ended
    
9
Months Ended
  
   
Sept.
30,
    
Sept.
30,
    
Sept.
30,
    
Sept.
30,
  
   
2018
    
2017
    
2018
    
2017
  
Gross realized gains from sales and calls
   $
45
     $
47
     $
45
     $
315
  
Gross realized losses from sales
    
(47
 )    
(42
 )    
(329
 )    
(58
 )
Net realized (losses) gains
   $
(2
 )   $
5
     $
(284
 )   $
257
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized
    
Fair
  
(In Thousands)
  
Cost
    
Value
  
                 
Due in one year or less
   $
23,128
     $
23,337
  
Due from one year through five years
    
39,807
      
39,533
  
Due from five years through ten years
    
38,688
      
37,515
  
Due after ten years
    
24,004
      
23,737
  
Sub-total
    
125,627
      
124,122
  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies:
                
Residential pass-through securities
    
57,279
      
55,131
  
Residential collateralized mortgage obligations
    
148,074
      
142,631
  
Commercial mortgage-backed securities
    
38,488
      
36,822
  
Total
   $
369,468
     $
358,706
  
Gain (Loss) on Securities [Table Text Block]
(In Thousands)
  
3 Months Ended
    
9 Months Ended
  
   
Sept. 30,
    
Sept. 30,
    
Sept. 30,
    
Sept. 30,
  
   
2018
    
2017
    
2018
    
2017
  
Net gains and losses recognized during the period on equity securities
   $
564
     $
0
     $
2,291
     $
0
  
Less: net gains and losses recognized during the period on equity securities sold during the period
    
(571
 )    
0
      
(2,321
 )    
0
  
                                 
Unrealized gains and losses recognized during the period on equity securities still held at the reporting date
   $
(7
 )   $
0
     $
(30
 )   $
0