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Note 5 - Investment Securities
 3 Months Ended
Mar. 31, 2016
Notes to Financial Statements  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
5.
INVESTMENT SECURITIES
 
Details of investment securities available-for-sale and held-to-maturity as of
March 31, 2016 and December 31, 2015 are as follows:
 
   
Available-for-Sale
  
   
March 31
, 201
6
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $ 128,972     $ 1,136     $ (172
)
   $ 129,936  
Commercial
     52,117       172       (549
)
     51,740  
Obligations of states and political subdivisions
     14,049       922       (1
)
     14,970  
Obligations of U.S. government-sponsored agencies
     2,000       —       (4
)
     1,996  
Corporate notes
     774      
—
       (8 )     766  
U.S. Treasury securities
     80      
—
       —       80  
Total
   $ 197,992     $ 2,230     $ (734
)
   $ 199,488  
 
 
   
Held-to-Maturity
  
   
March 31
, 201
6
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $ 18,205     $ 34     $ (56
)
   $ 18,183  
Obligations of U.S. government-sponsored agencies
     11,556       31       (8
)
     11,579  
Obligations of states and political subdivisions
     2,217       25       (1
)
     2,241  
Total
   $ 31,978     $ 90     $ (65
)
   $ 32,003  
 
   
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  
 
The scheduled maturities of investment securities available-for-sale and held-to-maturity as of
March 31, 2016 are presented in the following table:
 
   
Available-for-Sale
    
Held-to-Maturity
  
   
Amortized
Cost
    
Estimated
Fair
Value
    
Amortized
Cost
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Maturing within one year
   $ 2,119     $ 2,135     $ —     $ —  
Maturing after one to five years
     4,762       4,921       2,271       2,294  
Maturing after five to ten years
     114,008       114,795       9,852       9,879  
Maturing after ten years
     77,103       77,637       19,855       19,830  
Total
   $ 197,992     $ 199,488     $ 31,978     $ 32,003  
 
For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been allocated over maturity groupings based on the weighted-average contractual maturities of underlying collateral. The mortgage-backed securities generally mature earlier than their weighted-average contractual maturities because of principal prepayments.
 
 
The following table reflects gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of
March 31, 2016 and December 31, 2015.
 
   
Available-for-Sale
  
   
March 31
, 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
   $ 44,994     $ (128
)
   $ 5,321     $ (44
)
Commercial
     24,822       (107
)
     13,515       (442
)
Obligations of U.S. government-sponsored agencies
     1,996       (4
)
     —       —  
Corporate notes     766       (8 )     —       —  
Obligations of states and political subdivisions
     446       (1
)
     —       —  
Total
   $ 73,024     $ (248
)
   $ 18,836     $ (486
)
 
   
Held-to-Maturity
  
   
March 31
, 201
6
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $ 13,557     $ (56
)
   $ —     $ —  
Obligations of U.S. government-sponsored agencies
     1,579       (8
)
     —       —
 
Obligations of states and political subdivisions
     572       (1
)
     —       —  
Total
   $ 15,708     $ (65
)
   $ —     $ —
 
 
   
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
)
 
Management evaluates securities for other-than-temporary impairment no less frequently than quarterly and more frequently when economic or market concerns warrant such evaluation. Consideration is given to (i) the length of time and the extent to which fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, (iii) whether the Company intends to sell securities and (iv) whether it is more likely than not that the Company will be required to sell the securities before recovery of their amortized cost bases.
 
 
As of
March 31, 2016, 14 debt securities had been in a loss position for more than 12 months, and 68 debt securities had been in a loss position for less than 12 months. As of December 31, 2015, 13 debt securities had been in a loss position for more than 12 months, and 102 debt securities had been in a loss position for less than 12 months. As of both March 31, 2016 and December 31, 2015, the losses for all securities were considered to be a direct result of the effect that the prevailing interest rate environment had on the value of debt securities and were not related to the creditworthiness of the issuers. Further, the Company has the current intent and ability to retain its investments in the issuers for a period of time that management believes to be sufficient to allow for any anticipated recovery in fair value. Therefore, the Company did not recognize any other-than-temporary impairments as of March 31, 2016 and December 31, 2015.
 
Investment securities available-for-sale with a carrying value of $60.2
million and $61.3 million as of March 31, 2016 and December 31, 2015, respectively, were pledged to secure public deposits and for other purposes.
 
There were no gains realized on sales of securities available-for-sale during the three months ended March 31, 2016. Gains realized on sales of securities available-for-sale were approximately
$0.4 million for the year ended December 31, 2015. There were no losses on sales of securities during the three months ended March 31, 2016 or the year ended December 31, 2015.