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Investments (Tables)
9 Months Ended
Sep. 30, 2013
Investments [Abstract]  
Summary of amortized cost and fair value of investment securities
The amortized cost and fair value of investment securities at September 30, 2013 and December 31, 2012 were as follows (in thousands):

   
    Gross
    Gross
 
 
    Amortized
    Unrealized
    Unrealized
    Fair
September 30, 2013
    Cost
    Gains
    Losses
    Value
Available-for-sale securities:
       
  U.S. agency securities
 $    146,649
 $                  890
 $          (1,607)
 $       145,932
  U.S. treasury securities
         11,850
                          -
                (370)
            11,480
  Obligations of state and
       
    political subdivisions
         95,608
                  2,594
             (1,038)
            97,164
  Corporate obligations
         20,039
                     346
                (476)
            19,909
  Mortgage-backed securities in
       
    government sponsored entities
         41,869
                     789
                (190)
            42,468
  Equity securities in financial
       
     institutions
              803
                     696
                      -
              1,499
Total available-for-sale securities
 $    316,818
 $               5,315
 $          (3,681)
 $       318,452
         
December 31, 2012
       
Available-for-sale securities:
       
  U.S. agency securities
 $    125,125
 $               2,150
 $               (41)
 $       127,234
  U.S. treasury securities
           4,922
                       25
                      -
              4,947
  Obligations of state and
       
    political subdivisions
         95,288
                  5,721
                (134)
          100,875
  Corporate obligations
         21,699
                     452
                  (42)
            22,109
  Mortgage-backed securities in
       
    government sponsored entities
         52,072
                  1,728
                (127)
            53,673
  Equity securities in financial institutions
              912
                     502
                      -
              1,414
Total available-for-sale securities
 $    300,018
 $             10,578
 $             (344)
 $       310,252

Unrealized losses and fair value of investments
The following table shows the Company’s gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time, which individual securities have been in a continuous unrealized loss position, at September 30, 2013 and December 31, 2012 (in thousands). As of September 30, 2013, the Company owned 75 securities whose fair value was less than their cost basis.
   
September 30, 2013
    Less than Twelve Months
       Twelve Months or Greater
    Total
     
    Gross
 
    Gross
 
    Gross
   
    Fair
    Unrealized
    Fair
    Unrealized
    Fair
    Unrealized
   
    Value
    Losses
    Value
    Losses
    Value
    Losses
U.S. agency securities
 $        80,162
 $        (1,607)
 $                  -
 $                  -
 $        80,162
 $        (1,607)
U.S. treasury securities
11,480
(370)
                     -
                     -
11,480
(370)
Obligations of state and
           
    political subdivisions
20,396
(978)
             1,642
                (60)
22,038
(1,038)
Corporate obligations
12,009
(476)
                     -
                     -
12,009
(476)
Mortgage-backed securities in
           
   government sponsored entities
14,672
(176)
                827
                (14)
15,499
(190)
    Total securities
 $      138,719
 $        (3,607)
 $          2,469
 $             (74)
 $      141,188
 $        (3,681)
               
December 31, 2012
     
U.S. agency securities
 $          6,016
 $             (41)
 $                  -
 $                  -
 $          6,016
 $             (41)
Obligations of states and
           
     political subdivisions
             7,981
              (134)
                     -
                     -
             7,981
              (134)
Corporate obligations
           10,972
                (42)
                     -
                     -
           10,972
                (42)
Mortgage-backed securities in
           
     government sponsored entities
             8,651
              (127)
                     -
                     -
             8,651
              (127)
    Total securities
 $        33,620
 $           (344)
 $                  -
 $                  -
 $        33,620
 $           (344)
 
Gross gains and losses on available-for-sale securities
The gross gains and losses were as follows (in thousands):
 
 
       Three Months Ended
       Nine Months Ended
 
        September30,
        September30,
 
       2013
       2012
       2013
       2012
Gross gains
 $             91
 $                  240
 $              525
 $              561
Gross losses
                   -
                          -
                (140)
                      -
Net gains
 $             91
 $                  240
 $              385
 $              561
 
Summary of amortized cost and fair value of debt securities by contractual maturity
The amortized cost and fair value of debt securities at September 30, 2013, by contractual maturity, are shown below (in thousands):

 
       Amortized
 
 
       Cost
       Fair Value
Available-for-sale debt securities:
   
  Due in one year or less
 $      12,531
 $             12,626
  Due after one year through five years
       104,250
              104,486
  Due after five years through ten years
         84,875
                84,107
  Due after ten years
       114,359
              115,734
Total
 $    316,015
 $           316,953