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Note 4 - Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
As of December 31, 2018
  
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
Amortized
    
Unrealized
    
Unrealized
    
Estimated
  
(Amounts in thousands)
  
Costs
    
Gains
    
Losses
    
Fair Value
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
40,215
     $
202
     $
(330
 )   $
40,087
  
Obligations of state and political subdivisions
    
50,037
      
1,082
      
(589
 )    
50,530
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
142,355
      
129
      
(3,981
 )    
138,503
  
Corporate securities
    
3,022
      
—
      
(100
 )    
2,922
  
Commercial mortgage-backed securities
    
25,446
      
17
      
(701
 )    
24,762
  
Other asset-backed securities
    
123
      
1
      
—
      
124
  
Total
   $
261,198
     $
1,431
     $
(5,701
 )   $
256,928
  
   
As of December 31, 2017
  
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
Amortized
    
Unrealized
    
Unrealized
    
Estimated
  
(Amounts in thousands)
  
Costs
    
Gains
    
Losses
    
Fair Value
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
40,319
     $
196
     $
(146
 )   $
40,369
  
Obligations of state and political subdivisions
    
77,412
      
1,910
      
(478
 )    
78,844
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
116,061
      
69
      
(1,538
 )    
114,592
  
Corporate securities
    
5,079
      
18
      
(105
 )    
4,992
  
Commercial mortgage-backed securities
    
26,995
      
24
      
(378
 )    
26,641
  
Other asset-backed securities
    
1,529
      
4
      
(28
 )    
1,505
  
Total
   $
267,395
     $
2,221
     $
(2,673
 )   $
266,943
  
Amortized Cost and Estimated Fair Value Available for Sale Securities [Table Text Block]
   
Available-For-Sale
  
(Amounts in thousands)
  
Amortized Cost
    
Fair Value
  
Amounts maturing in:
  
 
 
 
  
 
 
 
One year or less
   $
54
     $
54
  
One year through five years
    
80,796
      
79,726
  
Five years through ten years
    
108,251
      
105,923
  
After ten years
    
72,097
      
71,225
  
Total
   $
261,198
     $
256,928
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
For Years Ended December 31,
  
(Amounts in thousands)
  
2018
    
2017
    
2016
  
Proceeds from sales of investment securities
   $
30,235
     $
64,349
     $
51,025
  
                         
Gross realized gains on sales of investment securities:
                        
U.S. government & agencies
   $
—
     $
—
     $
25
  
Obligations of state and political subdivisions
    
262
      
161
      
188
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
—
      
52
      
17
  
Corporate securities
    
1
      
79
      
105
  
Commercial mortgage-backed securities
    
—
      
3
      
4
  
Other asset-backed securities
    
—
      
20
      
13
  
Total gross realized gains on sales of investment securities
    
263
      
315
      
352
  
                         
Gross realized losses on sales of investment securities
                        
U.S. government & agencies
    
(43
 )    
—
      
(13
 )
Obligations of state and political subdivisions
    
(71
 )    
(102
 )    
(3
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
(40
 )    
(56
 )    
(64
 )
Corporate securities
    
—
      
(3
 )    
(27
 )
Commercial mortgage-backed securities
    
(19
 )    
(17
 )    
(1
 )
Other asset-backed securities
    
(46
 )    
—
      
—
  
Total gross realized losses on sales of investments securities
    
(219
 )    
(178
 )    
(108
 )
Gains on investment securities, net
   $
44
     $
137
     $
244
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
As of December 31, 2018
  
   
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
   $
7,223
     $
(39
 )   $
12,274
     $
(291
 )   $
19,497
     $
(330
 )
Obligations of states and political subdivisions
    
5,545
      
(40
 )    
16,320
      
(549
 )    
21,865
      
(589
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
21,791
      
(183
 )    
93,038
      
(3,798
 )    
114,829
      
(3,981
 )
Corporate securities
    
—
      
—
      
2,922
      
(100
 )    
2,922
      
(100
 )
Commercial mortgage-backed securities
    
1,548
      
(7
 )    
20,176
      
(694
 )    
21,724
      
(701
 )
Total temporarily impaired securities
   $
36,107
     $
(269
 )   $
144,730
     $
(5,432
 )   $
180,837
     $
(5,701
 )
   
As of December 31, 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
   $
18,140
     $
(102
 )   $
2,131
     $
(44
 )   $
20,271
     $
(146
 )
Obligations of states and political subdivisions
    
15,030
      
(255
 )    
8,368
      
(223
 )    
23,398
      
(478
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
75,323
      
(827
 )    
31,036
      
(711
 )    
106,359
      
(1,538
 )
Corporate securities
    
—
      
—
      
2,934
      
(105
 )    
2,934
      
(105
 )
Commercial mortgage-backed securities
    
11,162
      
(151
 )    
10,026
      
(227
 )    
21,188
      
(378
 )
Other asset-backed securities
    
1,157
      
(28
 )    
—
      
—
      
1,157
      
(28
 )
Total temporarily impaired securities
   $
120,812
     $
(1,363
 )   $
54,495
     $
(1,310
 )   $
175,307
     $
(2,673
 )