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Note 3 - Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
September 30
, 2017
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
83,391
     $
477
     $
(318
)
   $
83,550
  
Commercial
    
67,781
      
62
      
(705
)
    
67,138
  
Obligations of states and political subdivisions
    
5,424
      
231
      
—
 
    
5,655
  
Obligations of U.S. government-sponsored agencies
    
2,000
      
2
      
—
 
    
2,002
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
158,676
     $
772
     $
(1,023
)
   $
158,425
  
   
Held-to-Maturity
  
   
September 30
, 2017
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
15,976
     $
18
     $
(61
)
   $
15,933
  
Obligations of U.S. government-sponsored agencies
    
9,458
      
25
      
(79
)
    
9,404
  
Obligations of states and political subdivisions
    
1,943
      
26
      
(3
)
    
1,966
  
Total
   $
27,377
     $
69
     $
(143
)
   $
27,303
  
   
Available-for-Sale
  
   
December 31, 2016
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
99,922
     $
490
     $
(2,003
)
   $
98,409
  
Commercial
    
71,761
      
56
      
(1,287
)
    
70,530
  
Obligations of states and political subdivisions
    
9,759
      
390
      
(7
)
    
10,142
  
Obligations of U.S. government-sponsored agencies
    
2,000
      
—
      
(7
)
    
1,993
  
Corporate notes
    
756
      
—
      
—
      
756
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
184,278
     $
936
     $
(3,304
)
   $
181,910
  
   
Held-to-Maturity
  
   
December 31, 2016
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
14,684
     $
5
     $
(148
)
   $
14,541
  
Obligations of U.S. government-sponsored agencies
    
9,129
      
13
      
(222
)
    
8,920
  
Obligations of states and political subdivisions
    
2,091
      
2
      
(46
)
    
2,047
  
Total
   $
25,904
     $
20
     $
(416
)
   $
25,508
  
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
   $
490
     $
496
     $
—
     $
—
  
Maturing after one to five years
    
8,674
      
8,723
      
2,048
      
2,079
  
Maturing after five to ten years
    
71,462
      
71,596
      
2,904
      
2,899
  
Maturing after ten years
    
78,050
      
77,610
      
22,425
      
22,325
  
Total
   $
158,676
     $
158,425
     $
27,377
     $
27,303
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
September 30
, 2017
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
38,784
     $
(115
)
   $
14,350
     $
(203
)
Commercial
    
19,576
      
(145
)
    
37,291
      
(560
)
U.S. Treasury securities
    
80
      
—
 
    
—
      
—
  
Total
   $
58,440
     $
(260
)
   $
51,641
     $
(763
)
   
Held-to-Maturity
  
   
September 30
, 2017
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:      
Commercial
   $
9,643
     $
(58
 )   $
423
     $
(3
 )
Obligations of U.S. government-sponsored agencies    
3,217
      
(27
 )    
4,345
      
(52
 )
Obligations of states and political subdivisions
    
—
      
—
 
    
543
      
(3
 )
Total
   $
12,860
     $
(85
)
   $
5,311
     $
(58
)
   
Available-for-Sale
  
   
December 31, 2016
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
85,741
     $
(1,976
)
   $
1,904
     $
(27
)
Commercial
    
54,475
      
(946
)
    
10,721
      
(341
)
Obligations of U.S. government-sponsored agencies
    
1,993
      
(7
)
    
—
      
—
  
Obligations of states and political subdivisions
    
434
      
(7
 )    
—
      
—
  
U.S. Treasury securities
    
80
      
—
 
    
—
      
—
  
Total
   $
142,723
     $
(2,936
)
   $
12,625
     $
(368
)
   
Held-to-Maturity
  
   
December 31, 2016
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
12,776
     $
(148
)
   $
—
     $
—
  
Obligations of U.S. government-sponsored agencies
    
7,957
      
(222
)
    
—
      
—
 
Obligations of states and political subdivisions
    
1,628
      
(46
)
    
—
      
—
  
Total
   $
22,361
     $
(416
)
   $
—
     $
—