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Note 4 - Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
March 31
, 201
9
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
70,759
     $
173
     $
(1,027
)
   $
69,905
  
Commercial
    
52,786
      
11
      
(1,276
)
    
51,521
  
Obligations of states and political subdivisions
    
5,608
      
74
      
(1
)
    
5,681
  
U.S. Treasury securities
    
79
      
—
      
(1
 )    
78
  
Total
   $
129,232
     $
258
     $
(2,305
)
   $
127,185
  
   
Held-to-Maturity
  
   
March 31, 2019
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
11,143
     $
—
     $
(229
)
   $
10,914
  
Obligations of U.S. government-sponsored agencies
    
8,010
      
—
      
(145
)
    
7,865
  
Obligations of states and political subdivisions
    
1,687
      
6
      
(5
)
    
1,688
  
Total
   $
20,840
     $
6
     $
(379
)
   $
20,467
  
   
Available-for-Sale
  
   
December 31, 2018
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
73,859
     $
113
     $
(1,517
)
   $
72,455
  
Commercial
    
56,101
      
10
      
(1,822
 )    
54,289
  
Obligations of states and political subdivisions
    
5,617
      
51
      
(4
 )    
5,664
  
U.S. Treasury securities
    
79
      
—
      
—
      
79
  
Total
   $
135,656
     $
174
     $
(3,343
)
   $
132,487
  
   
Held-to-Maturity
  
   
December 31, 2018
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
11,716
     $
—
     $
(349
)
   $
11,367
  
Obligations of U.S. government-sponsored agencies
    
8,026
      
—
      
(244
)
    
7,782
  
Obligations of states and political subdivisions
    
1,720
      
—
      
(17
)
    
1,703
  
Total
   $
21,462
     $
—
     $
(610
)
   $
20,852
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Available-for-Sale
    
Held-to-Maturity
  
   
Amortized
Cost
    
Estimated
Fair
Value
    
Amortized
Cost
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Maturing within one year
   $
1,103
     $
1,104
     $
122
     $
122
  
Maturing after one to five years
    
37,432
      
36,946
      
924
      
928
  
Maturing after five to ten years
    
52,928
      
52,004
      
10,235
      
10,040
  
Maturing after ten years
    
37,769
      
37,131
      
9,559
      
9,377
  
Total
   $
129,232
     $
127,185
     $
20,840
     $
20,467
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
March 31
, 201
9
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
139
     $
—
 
   $
52,754
     $
(1,027
)
Commercial
    
3
      
—
 
    
50,743
      
(1,276
)
Obligations of states and political subdivisions    
125
      
—
      
418
      
(1
 )
U.S. Treasury securities
    
78
      
(1
 )    
—
      
—
  
Total
   $
345
     $
(1
)
   $
103,915
     $
(2,304
)
   
Held-to-Maturity
  
   
March 31
, 2019
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
—
     $
—
     $
10,914
     $
(229
 )
Obligations of U.S. government-sponsored agencies
    
—
      
—
      
7,866
      
(145
)
Obligations of states and political subdivisions
    
—
      
—
      
912
      
(5
 )
Total
   $
—
     $
—
     $
19,692
     $
(379
)
   
Available-for-Sale
  
   
December 31, 201
8
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
9,417
     $
(87
)
   $
53,507
     $
(1,430
)
Commercial
    
461
      
(3
)
    
53,430
      
(1,819
)
Obligations of states and political subdivisions
    
879
      
(2
)
    
420
      
(2
 )
U.S. Treasury securities
    
79
      
—
      
—
      
—
  
Total
   $
10,836
     $
(92
)
   $
107,357
     $
(3,251
)
   
Held-to-Maturity
  
   
December 31, 2018
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
—
     $
—
     $
11,367
     $
(349
 )
Obligations of U.S. government-sponsored agencies
    
—
      
—
      
7,782
      
(244
)
Obligations of states and political subdivisions
    
770
      
—
      
933
      
(17
 )
Total
   $
770
     $
—
     $
20,082
     $
(610
)