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Note 3 - Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
December 31, 2016
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
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
  
   
Available-for-Sale
  
   
December 31, 2015
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
135,104
     $
998
     $
(608
)
   $
135,494
  
Commercial
    
45,961
      
164
      
(616
)
    
45,509
  
Obligations of states and political subdivisions
    
14,071
      
931
      
(4
)
    
14,998
  
Obligations of U.S. government-sponsored agencies
    
1,999
      
—
      
(17
)
    
1,982
  
Corporate notes
    
780
      
—
      
—
      
780
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
197,995
     $
2,093
     $
(1,245
)
   $
198,843
  
   
Held-to-Maturity
  
   
December 31, 2015
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dol
lars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
16,321
     $
33
     $
(170
)
   $
16,184
  
Obligations of U.S. government-sponsored agencies
    
13,766
      
19
      
(71
)
    
13,714
  
Obligations of states
and political subdivisions
    
2,272
      
18
      
(4
 )    
2,286
  
Total
   $
32,359
     $
70
     $
(245
)
   $
32,184
  
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
   $
1,921
     $
1,929
     $
—
     $
—
  
Maturing after one to five years
    
4,654
      
4,705
      
1,986
      
1,995
  
Maturing after five to ten years
    
83,901
      
82,804
      
3,335
      
3,268
  
Maturing after ten years
    
93,802
      
92,472
      
20,583
      
20,245
  
Total
   $
184,278
     $
181,910
     $
25,904
     $
25,508
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
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
)
   $
—
     $
—
 
   
Available-for-Sale
  
   
December 31, 2015
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
83,403
     $
(458
)
   $
9,061
     $
(150
)
Commercial
    
24,337
      
(272
)
    
8,918
      
(344
)
Obligations of U.S. government-sponsored agencies
    
1,982
      
(17
)
    
—
      
—
  
Corporate notes
    
779
      
—
      
—
      
—
  
Obligations of states and political subdivisions
    
707
      
(4
 )    
—
      
—
 
Total
   $
111,208
     $
(751
)
   $
17,979
     $
(494
)
   
Held-to-Maturity
  
   
December 31, 2015
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:      
Commercial
   $
14,143
     $
(170
 )   $
—
     $
—
 
Obligations of U.S. government-sponsored agencies
    
11,163
      
(44
 )    
1,560
      
(27
 )
Obligations of states and political subdivisions
    
572
      
(4
)
    
—
      
—
  
Total
   $
25,878
     $
(218
)
   $
1,560
     $
(27
)