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Note 3 - Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
March 31
, 201
8
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
87,463
     $
202
     $
(1,983
)
   $
85,682
  
Commercial
    
67,846
      
16
      
(1,868
)
    
65,994
  
Obligations of states and political subdivisions
    
4,749
      
140
      
(3
)
    
4,886
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
160,138
     $
358
     $
(3,854
)
   $
156,642
  
   
Held-to-Maturity
  
   
March 31, 2018
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
14,237
     $
—
     $
(342
)
   $
13,895
  
Obligations of U.S. government-sponsored agencies
    
9,209
      
—
      
(255
)
    
8,954
  
Obligations of states and political subdivisions
    
1,854
      
—
      
(16
)
    
1,838
  
Total
   $
25,300
     $
—
     $
(613
)
   $
24,687
  
   
Available-for-Sale
  
   
December 31, 2017
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
83,360
     $
286
     $
(860
)
   $
82,786
  
Commercial
    
67,281
      
27
      
(1,234
)
    
66,074
  
Obligations of states and political subdivisions
    
4,752
      
182
      
(3
)
    
4,931
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
155,473
     $
495
     $
(2,097
)
   $
153,871
  
   
Held-to-Maturity
  
   
December 31, 2017
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
15,065
     $
1
     $
(186
)
   $
14,880
  
Obligations of U.S. government-sponsored agencies
    
9,326
      
7
      
(144
)
    
9,189
  
Obligations of states and political subdivisions
    
1,888
      
5
      
(13
)
    
1,880
  
Total
   $
26,279
     $
13
     $
(343
)
   $
25,949
  
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
   $
699
     $
707
     $
—
     $
—
  
Maturing after one to five years
    
22,234
      
21,719
      
1,827
      
1,813
  
Maturing after five to ten years
    
80,332
      
78,419
      
4,293
      
4,217
  
Maturing after ten years
    
56,873
      
55,797
      
19,180
      
18,657
  
Total
   $
160,138
     $
156,642
     $
25,300
     $
24,687
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
March 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
   $
56,885
     $
(1,209
)
   $
21,126
     $
(774
)
Commercial
    
20,155
      
(398
)
    
44,735
      
(1,470
)
Obligations of states and political subdivisions    
426
      
(3
 )    
—
      
—
  
U.S. Treasury securities
    
80
      
—
      
—
      
—
  
Total
   $
77,546
     $
(1,610
)
   $
65,861
     $
(2,244
)
   
Held-to-Maturity
  
   
March 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
   $
7,642
     $
(150
)
   $
6,253
     $
(192
 )
Obligations of U.S. government-sponsored agencies
    
1,656
      
(23
)
    
7,298
      
(232
)
Obligations of states and political subdivisions
    
1,311
      
(8
)
    
527
      
(8
 )
Total
   $
10,609
     $
(181
)
   $
14,078
     $
(432
)
   
Available-for-Sale
  
   
December 31, 201
7
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
47,007
     $
(467
)
   $
21,122
     $
(393
)
Commercial
    
18,554
      
(180
)
    
46,312
      
(1,054
)
Obligations of states and political subdivisions
    
428
      
(3
 )    
—
      
—
  
U.S. Treasury securities
    
80
      
—
      
—
      
—
  
Total
   $
66,069
     $
(650
)
   $
67,434
     $
(1,447
)
   
Held-to-Maturity
  
   
December 31, 2017
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
7,895
     $
(63
)
   $
6,675
     $
(123
 )
Obligations of U.S. government-sponsored agencies
    
865
      
(2
)
    
7,388
      
(142
)
Obligations of states and political subdivisions
    
571
      
(3
)
    
531
      
(10
 )
Total
   $
9,331
     $
(68
)
   $
14,594
     $
(275
)