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Investment in Securities (Tables)
9 Months Ended
Sep. 30, 2013
Investment in Securities [Abstract]  
Schedule of Investment Securities

The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:

    September 30, 2013
          Gross   Gross      
    Amortized   Unrealized   Unrealized      
(In thousands)       Cost       Gains       Losses       Fair Value
State and political subdivisions   $       297,331   $        9,944   $          2,304   $      304,971
Certificates of deposit     3,750     -     -     3,750
       Total   $ 301,081   $ 9,944   $ 2,304   $ 308,721
 
    December 31, 2012
          Gross   Gross      
    Amortized   Unrealized   Unrealized      
(In thousands)   Cost   Gains   Losses   Fair Value
State and political subdivisions   $ 315,345   $ 19,960   $ 112   $ 335,193
Certificates of deposit     6,742     -     -     6,742
       Total   $ 322,087   $ 19,960   $ 112   $ 341,935

Schedule of the Fair Value of Securities with Unrealized Losses

The fair values of securities with unrealized losses are as follows:

    September 30, 2013
    Less than 12 months   12 months or more   Total
    Estimated   Unrealized   Estimated   Unrealized   Estimated   Unrealized
(In thousands)       Fair Value       Losses       Fair Value       Losses       Fair Value       Losses
State and political                                    
       subdivisions   $         68,468   $           2,304   $                -   $                 -   $        68,468   $           2,304
Certificates of deposit     -     -     -     -     -     -
       Total   $ 68,468   $ 2,304   $ -   $ -   $ 68,468   $ 2,304
 
    December 31, 2012
    Less than 12 months   12 months or more   Total
    Estimated   Unrealized   Estimated   Unrealized   Estimated   Unrealized
(In thousands)   Fair Value   Losses   Fair Value   Losses   Fair Value   Losses
State and political                                    
       subdivisions   $ 19,758   $ 112   $ -   $ -   $ 19,758   $ 112
Certificates of deposit     -     -     -     -     -     -
       Total   $ 19,758   $ 112   $ -   $ -   $ 19,758   $ 112

Schedule of Amortized Cost and Fair Value of Investment
    September 30, 2013
(In thousands)       Amortized Cost       Fair Value
Due in 1 year or less   $ 12,838   $ 12,961
Due after 1 year through 5 years     69,279     73,393
Due after 5 years through 10 years     139,442     141,773
Due after 10 years     79,522     80,594
       Total   $ 301,081   $ 308,721