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Note 3 - Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
As of September 30, 2017
  
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
Amortized
    
Unrealized
    
Unrealized
    
Estimated
  
(Amounts in thousands)
  
Cost
    
Gain
    
Loss
    
Fair Value
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
36,437
     $
122
     $
(85
 )   $
36,474
  
Obligations of state and political subdivisions
    
52,609
      
1,343
      
(102
 )    
53,850
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
105,755
      
165
      
(696
 )    
105,224
  
Corporate securities
    
6,945
      
97
      
(74
 )    
6,968
  
Commercial mortgage-backed securities
    
26,272
      
29
      
(153
 )    
26,148
  
Other asset-backed securities
    
3,846
      
6
      
(22
 )    
3,830
  
Total
   $
231,864
     $
1,762
     $
(1,132
 )   $
232,494
  
                                 
Held-to-maturity securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Obligations of state and political subdivisions
   $
30,724
     $
1,238
     $
(80
 )   $
31,882
  
   
As of December 31, 2016
  
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
Amortized
    
Unrealized
    
Unrealized
    
Estimated
  
(Amounts in thousands)
  
Cost
    
Gain
    
Loss
    
Fair Value
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
10,427
     $
10
     $
(83
 )   $
10,354
  
Obligations of state and political subdivisions
    
58,847
      
1,001
      
(420
 )    
59,428
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
71,068
      
33
      
(1,497
 )    
69,604
  
Corporate securities
    
16,153
      
103
      
(140
 )    
16,116
  
Commercial mortgage-backed securities
    
15,786
      
9
      
(281
 )    
15,514
  
Other asset-backed securities
    
4,237
      
8
      
(87
 )    
4,158
  
Total
   $
176,518
     $
1,164
     $
(2,508
 )   $
175,174
  
                                 
Held-to-maturity securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Obligations of state and political subdivisions
   $
31,187
     $
710
     $
(523
 )   $
31,374
  
Amortized Cost and Estimated Fair Value Available for Sale Securities [Table Text Block]
   
Available-For-Sale
    
Held-To-Maturity
  
(Amounts in thousands)
  
Amortized Cost
    
Fair Value
    
Amortized Cost
    
Fair Value
  
Amounts maturing in:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
One year or less
   $
1,379
     $
1,382
     $
95
     $
98
  
After one year through five years
    
75,268
      
75,183
      
9,834
      
10,354
  
After five years through ten years
    
72,459
      
72,951
      
7,656
      
7,838
  
After ten years
    
82,758
      
82,978
      
13,139
      
13,592
  
Total
   $
231,864
     $
232,494
     $
30,724
     $
31,882
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
(Amounts in thousands)
  
2017
    
2016
    
2017
    
2016
  
Proceeds from sales of securities
   $
20,640
     $
12,310
     $
47,892
     $
46,699
  
                                 
Gross realized gains on sales of securities:
                                
U.S. government & agencies
   $
—
     $
9
     $
—
     $
17
  
Obligations of state and political subdivisions
    
31
      
25
      
112
      
136
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
16
      
12
      
53
      
14
  
Corporate securities
    
20
      
29
      
30
      
105
  
Commercial mortgage-backed securities
    
3
      
—
      
3
      
4
  
Other asset-backed securities
    
—
      
1
      
—
      
14
  
Total gross realized gains on sales of securities
    
70
      
76
      
198
      
290
  
Gross realized losses on sales of securities:
                                
U.S. government & agencies
    
—
      
—
      
—
      
(4
 )
Obligations of state and political subdivisions
    
(10
 )    
(3
 )    
(10
 )    
(3
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
(22
 )    
—
      
(46
 )    
(64
 )
Corporate securities
    
—
      
(2
 )    
(3
 )    
(27
 )
Commercial mortgage-backed securities
    
—
      
(1
 )    
—
      
—
  
Other asset-backed securities
    
—
      
—
      
—
      
—
  
Total gross realized losses on sales of securities
    
(32
 )    
(6
 )    
(59
 )    
(98
 )
Gain on investment securities, net
   $
38
     $
70
     $
139
     $
192
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
As of September 30, 2017
  
   
Less Than 12 Months
    
12 Months or More
    
Total
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
(Amounts in thousands)
  
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
15,565
     $
(85
 )   $
—
     $
—
     $
15,565
     $
(85
 )
Obligations of states and political subdivisions
    
7,535
      
(39
 )    
4,644
      
(63
 )    
12,179
      
(102
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
57,273
      
(293
 )    
23,194
      
(403
 )    
80,467
      
(696
 )
Corporate securities
    
2,029
      
(14
 )    
940
      
(60
 )    
2,969
      
(74
 )
Commercial mortgage-backed securities
    
10,481
      
(48
 )    
9,672
      
(105
 )    
20,153
      
(153
 )
Other asset-backed securities
    
2,163
      
(20
 )    
1,268
      
(2
 )    
3,431
      
(22
 )
Total temporarily impaired securities
   $
95,046
     $
(499
 )   $
39,718
     $
(633
 )   $
134,764
     $
(1,132
 )
                                                 
Held-to-maturity securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Obligations of states and political subdivisions
   $
1,019
     $
(3
 )   $
1,965
     $
(77
 )   $
2,984
     $
(80
 )
   
As of December 31, 2016
  
   
Less Than 12 Months
    
12 Months or More
    
Total
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
(Amounts in thousands)
  
Value
    
Loss
    
Value
    
Loss
    
Value
    
Loss
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
9,139
     $
(83
 )   $
—
     $
—
     $
9,139
     $
(83
 )
Obligations of states and political subdivisions
    
20,329
      
(420
 )    
—
      
—
      
20,329
      
(420
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
52,345
      
(1,396
 )    
4,108
      
(101
 )    
56,453
      
(1,497
 )
Corporate securities
    
8,908
      
(140
 )    
—
      
—
      
8,908
      
(140
 )
Commercial mortgage-backed securities
    
12,041
      
(191
 )    
2,849
      
(90
 )    
14,890
      
(281
 )
Other asset-backed securities
    
2,280
      
(28
 )    
1,346
      
(59
 )    
3,626
      
(87
 )
Total temporarily impaired securities
   $
105,042
     $
(2,258
 )   $
8,303
     $
(250
 )   $
113,345
     $
(2,508
 )
                                                 
Held-to-maturity securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Obligations of states and political subdivisions
   $
11,639
     $
(425
 )   $
933
     $
(98
 )   $
12,572
     $
(523
 )