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Investment Securities (Tables)
3 Months Ended
Mar. 31, 2015
Investment Securities [Abstract]  
Amortized cost and fair value of investment securities held to maturity
The amortized cost and fair value of investment securities held to maturity are as follows (dollars in thousands):

  
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
Losses
  
Fair
Value
 
March 31, 2015:
        
         
US Treasury securities
 
$
26,118
  
$
543
  
$
-
  
$
26,661
 
US Agency securities
  
17,029
   
266
   
-
   
17,295
 
US Government sponsored mortgage-backed securities
  
14,772
   
132
   
-
   
14,904
 
Total
 
$
57,919
  
$
941
  
$
-
  
$
58,860
 
                 
December 31, 2014:
                
                 
US Treasury securities
 
$
27,140
  
$
465
  
$
29
  
$
27,576
 
US Agency securities
  
17,044
   
130
   
57
   
17,117
 
US Government sponsored mortgage-backed securities
  
15,432
   
48
   
50
   
15,430
 
Total
 
$
59,616
  
$
643
  
$
136
  
$
60,123
 
Schedule of temporary impairment losses
In addition, the Bank does not intend to sell, nor does it believe it will be more likely than not that it will be required to sell, any impaired securities prior to a recovery of amortized cost.
 
  
Less than 12 months
  
12 Months or More
  
Total
 
  
Fair Value
  
Unrealized
Losses
  
Fair Value
  
Unrealized
Losses
  
Fair Value
  
Unrealized
Losses
 
December 31, 2014:
 
(dollars in thousands)
 
                         
US Treasury securities
 
$
6,953
  
$
29
  
$
-
  
$
-
  
$
6,953
  
$
29
 
US Agency securities
  
10,024
   
57
   
-
   
-
   
10,024
   
57
 
US Government sponsored mortgage-backed securities
  
13,405
   
50
   
-
   
-
   
13,405
   
50
 
Total
 
$
30,382
  
$
136
  
$
-
  
$
-
  
$
30,382
  
$
136
 
Amortized cost and estimated fair value of debt securities
The amortized cost and estimated fair value of debt securities at March 31, 2015, by contractual maturity are shown in the following table.  Actual maturities may differ from contractual maturities, because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

  
Held to Maturity
(dollars in thousands)
 
  
Amortized
Cost
  
Estimated Fair
 Value
 
     
Due in one year or less
 
$
7,021
  
$
7,082
 
Due from one year to five years
  
33,208
   
33,723
 
Due from five years to ten years
  
2,918
   
3,151
 
US Government sponsored mortgage-backed securities
  
14,772
   
14,904
 
  
$
57,919
  
$
58,860