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Note 4 - Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
As of December 31, 2019
  
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
Amortized
    
Unrealized
    
Unrealized
    
Estimated
  
(Amounts in thousands)
  
Costs
    
Gains
    
Losses
    
Fair Value
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
38,291
     $
469
     $
(27
 )   $
38,733
  
Obligations of state and political subdivisions
    
40,702
      
1,422
      
(26
 )    
42,098
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
179,114
      
2,163
      
(442
 )    
180,835
  
Corporate securities
    
3,005
      
6
      
(45
 )    
2,966
  
Commercial mortgage-backed securities
    
19,126
      
221
      
(40
 )    
19,307
  
Other asset-backed securities
    
3,019
      
—
      
(8
 )    
3,011
  
Total
   $
283,257
     $
4,281
     $
(588
 )   $
286,950
  
   
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
  
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
   $
6,542
     $
6,567
  
One year through five years
    
139,442
      
141,580
  
Five years through ten years
    
74,651
      
75,295
  
After ten years
    
62,622
      
63,508
  
Total
   $
283,257
     $
286,950
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
For Years Ended December 31,
  
(Amounts in thousands)
  
2019
    
2018
  
Proceeds from sales of investment securities
   $
117,299
     $
30,235
  
                 
Gross realized gains on sales of investments securities:
                
U.S. government & agencies
   $
49
     $
—
  
Obligations of state and political subdivisions
    
482
      
262
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
108
      
—
  
Corporate securities
    
—
      
1
  
Commercial mortgage-backed securities
    
34
      
—
  
Total gross realized gains on sales of investment securities
    
673
      
263
  
                 
Gross realized losses on sales of investment securities
                
U.S. government & agencies
    
(16
 )    
(43
 )
Obligations of state and political subdivisions
    
(95
 )    
(71
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
(321
 )    
(40
 )
Commercial mortgage-backed securities
    
(54
 )    
(19
 )
Other asset-backed securities
    
(1
 )    
(46
 )
Total gross realized losses on sales of investment securities
    
(487
 )    
(219
 )
Gains on sales of investment securities, net
   $
186
     $
44
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
As of December 31, 2019
  
   
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
   $
6,473
     $
(25
 )   $
380
     $
(2
 )   $
6,853
     $
(27
 )
Obligations of states and political subdivisions
    
2,249
      
(26
 )    
—
      
—
      
2,249
      
(26
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
31,817
      
(207
 )    
22,166
      
(235
 )    
53,983
      
(442
 )
Corporate securities
    
—
      
—
      
955
      
(45
 )    
955
      
(45
 )
Commercial mortgage-backed securities
    
1,464
      
(1
 )    
4,549
      
(39
 )    
6,013
      
(40
 )
Other asset-backed securities
    
3,011
      
(8
 )    
—
      
—
      
3,011
      
(8
 )
Total temporarily impaired securities
   $
45,014
     $
(267
 )   $
28,050
     $
(321
 )   $
73,064
     $
(588
 )
   
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
 )