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Note 3 - Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
June 30
, 2017
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
90,308
     $
564
     $
(304
)
   $
90,568
  
Commercial
    
72,822
      
60
      
(802
)
    
72,080
  
Obligations of states and political subdivisions
    
7,131
      
426
      
—
 
    
7,557
  
Obligations of U.S. government-sponsored agencies
    
2,000
      
2
      
—
 
    
2,002
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
172,341
     $
1,052
     $
(1,106
)
   $
172,287
  
   
Held-to-Maturity
  
   
June 30
, 2017
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
16,950
     $
28
     $
(55
)
   $
16,923
  
Obligations of U.S. government-sponsored agencies
    
9,594
      
27
      
(71
)
    
9,550
  
Obligations of states and political subdivisions
    
2,000
      
27
      
(4
)
    
2,023
  
Total
   $
28,544
     $
82
     $
(130
)
   $
28,496
  
   
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
   $
381
     $
385
     $
—
     $
—
  
Maturing after one to five years
    
8,581
      
8,654
      
2,230
      
2,264
  
Maturing after five to ten years
    
74,675
      
74,888
      
2,908
      
2,899
  
Maturing after ten years
    
88,704
      
88,360
      
23,406
      
23,333
  
Total
   $
172,341
     $
172,287
     $
28,544
     $
28,496
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
June 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
   $
47,011
     $
(273
)
   $
2,086
     $
(31
)
Commercial
    
32,660
      
(402
)
    
27,146
      
(400
)
U.S. Treasury securities
    
80
      
—
 
    
—
      
—
  
Total
   $
79,751
     $
(675
)
   $
29,232
     $
(431
)
   
Held-to-Maturity
  
   
June 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
   $
7,514
     $
(55
 )   $
—
     $
—
  
Obligations of U.S. government-sponsored agencies    
7,570
      
(71
 )    
—
      
—
  
Obligations of states and political subdivisions
    
—
      
—
 
    
547
      
(4
 )
Total
   $
15,084
     $
(126
)
   $
547
     $
(4
)
   
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
)
   $
—
     $
—