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Note 5 - Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
June 30
, 201
6
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $ 110,687     $ 1,849     $ (20
)
   $ 112,516  
Commercial
     53,472       295       (456
)
     53,311  
Obligations of states and political subdivisions
     10,267       662      
—
 
     10,929  
Obligations of U.S. government-sponsored agencies
     2,000       8      
—
 
     2,008  
Corporate notes
     767      
2
      
—
       769  
U.S. Treasury securities
     80      
—
      
—
       80  
Total
   $ 177,273     $ 2,816     $ (476
)
   $ 179,613  
   
Held-to-Maturity
  
   
June 30
, 201
6
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $ 17,396     $ 105     $
—
 
   $ 17,501  
Obligations of U.S. government-sponsored agencies
     13,972       77       (2
)
     14,047  
Obligations of states and political subdivisions
     2,184       40       (3
)
     2,221  
Total
   $ 33,552     $ 222     $ (5
)
   $ 33,769  
   
Available-for-Sale
  
   
December 31, 201
5
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
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, 201
5
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dollars 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
   $ 1,930     $ 1,947     $
—
     $
—
  
Maturing after one to five years
     6,124       6,256       1,463       1,509  
Maturing after five to ten years
     94,262       95,782       9,653       9,674  
Maturing after ten years
     74,957       75,628       22,436       22,586  
Total
   $ 177,273     $ 179,613     $ 33,552     $ 33,769  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
June 30
, 201
6
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $ 1,646     $ (2
)
   $ 2,099     $ (441
)
Commercial
     13,893       (15
)
     13,612       (18
)
U.S. Treasury securities
    
80
      
—
 
    
—
      
—
  
Total
   $ 15,619     $ (17
)
   $ 15,711     $ (459
)
   
Held-to-Maturity
  
   
June 30
, 201
6
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Obligations of U.S. government-sponsored agencies
   $ 1,396     $ (2 )   $
—
     $
—
  
Obligations of states and political subdivisions
     568       (3
)
    
—
      
—
  
Total
   $ 1,964     $ (5
)
   $
—
     $
—
 
   
Available-for-Sale
  
   
December 31, 201
5
  
   
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, 201
5
  
   
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
)