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Note 3 - Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
June 30
, 2018
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
80,551
     $
134
     $
(1,997
)
   $
78,688
  
Commercial
    
63,674
      
13
      
(2,068
)
    
61,619
  
Obligations of states and political subdivisions
    
1,010
      
26
      
(2
)
    
1,034
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
145,315
     $
173
     $
(4,067
)
   $
141,421
  
   
Held-to-Maturity
  
   
June 30
, 2018
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
13,410
     $
—
     $
(399
)
   $
13,011
  
Obligations of U.S. government-sponsored agencies
    
9,110
      
—
      
(283
)
    
8,827
  
Obligations of states and political subdivisions
    
1,799
      
—
      
(22
)
    
1,777
  
Total
   $
24,319
     $
—
     $
(704
)
   $
23,615
  
   
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
   $
234
     $
235
     $
—
     $
—
  
Maturing after one to five years
    
33,949
      
33,267
      
1,766
      
1,750
  
Maturing after five to ten years
    
64,634
      
62,494
      
6,168
      
6,024
  
Maturing after ten years
    
46,498
      
45,425
      
16,385
      
15,841
  
Total
   $
145,315
     $
141,421
     $
24,319
     $
23,615
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
June 30
, 2018
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
33,424
     $
(722
)
   $
39,041
     $
(1,275
)
Commercial
    
16,215
      
(418
)
    
44,911
      
(1,650
)
Obligations of states and political subdivisions    
424
      
(2
 )    
—
      
—
  
U.S. Treasury securities
    
80
      
—
      
—
      
—
  
Total
   $
50,143
     $
(1,142
)
   $
83,952
     $
(2,925
)
   
Held-to-Maturity
  
   
June 30
, 2018
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:                                
Commercial
   $
4,730
     $
(109
 )   $
8,280
     $
(290
 )
Obligations of U.S. government-sponsored agencies    
1,633
      
(25
 )    
7,194
      
(258
 )
Obligations of states and political subdivisions
    
841
      
(16
)
    
524
      
(6
 )
Total
   $
7,204
     $
(150
)
   $
15,998
     $
(554
)
   
Available-for-Sale
  
   
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:
                                
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
)