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Investments (Tables)
 9 Months Ended
Sep. 30, 2012
Amortized cost and Estimated fair values of Investments Available-for-sale

The amortized cost and estimated fair values of investments available-for-sale at the dates indicated are presented in the following table:

 

  At September 30, 2012   At December 31, 2011
        Gross   Gross   Estimated       Gross   Gross   Estimated
    Amortized   Unrealized   Unrealized   Fair   Amortized   Unrealized   Unrealized   Fair
(In thousands)   Cost   Gains   Losses   Value   Cost   Gains   Losses   Value
U.S. government agencies   $ 133,254     $ 1,385     $ —     $ 134,639     $ 197,816     $ 2,436     $ —     $ 200,252  
State and municipal     160,736       14,373       —       175,109       160,657       12,456       (2 )     173,111  
M ortgage-backed     498,560       22,278       (64 )     520,774       551,518       18,639       (13 )     570,144  
Corporate debt     2,000       —       (8 )     1,992       2,000       —       (22 )     1,978  
Trust preferred     1,716       —       (288 )     1,428       5,936       260       (480 )     5,716  
Total debt securities     796,266       38,036       (360 )     833,942       917,927       33,791       (517 )     951,201  
M arketable equity securities     723       —       —        723       100       —       —       100  
Total investments available-for-sale   $ 796,989     $ 38,036     $ (360 )   $ 834,665     $ 918,027     $ 33,791     $ (517 )   $ 951,301  
Activity of OTTI on investment Securities Due to Credit Losses Recognized in Earnings

The following table provides the activity of OTTI on investment securities due to credit losses recognized in earnings for the period indicated:

 

(In thousands)   OTTI Losses
Cumulative credit losses on investment securities, through January 1, 2012   $ 422  
Additions for credit losses not previously recognized     95  
Cumulative credit losses on investment securities, through September 30, 2012   $ 517  

 
Amortized Cost and Estimated Fair Values of Investments Held-To-Maturity

The amortized cost and estimated fair values of investments held-to-maturity at the dates indicated are presented in the following table:

 

    At September 30, 2012   At December 31, 2011
        Gross   Gross   Estimated       Gross   Gross   Estimated
    Amortized   Unrealized   Unrealized   Fair   Amortized   Unrealized   Unrealized   Fair
(In thousands)   Cost   Gains   Losses   Value   Cost   Gains   Losses   Value
U.S. government agencies   $ 59,500     $ 211     $ —     $ 59,711     $ 54,983     $ 406     $ —     $ 55,389  
State and municipal     146,769       6,426       (60 )     153,135       123,075       5,244       (1 )     128,318  
M ortgage-backed     344       45       —       389       407       53       —       460  
Total investments held-to-maturity   $ 206,613     $ 6,682     $ (60 )   $ 213,235     $ 178,465     $ 5,703     $ (1 )   $ 184,167  

 
Other Equity Securities

Other equity securities at the dates indicated are presented in the following table:

 

In thousands)   September 30, 2012   December 31, 2011
Federal Reserve Bank stock   $ 8,269     $ 7,530  
Federal Home Loan Bank of Atlanta stock     25,371       27,328  
Other equities     —       75  
Total equity securities   $ 33,640     $ 34,933  
Available-for-Sale Securities
  
Gross Unrealized Losses and Fair Value by Length of Time

Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in an unrealized loss position at the dates indicated are presented in the following table:

 

    At September 30, 2012
            Continuous Unrealized    
            Losses Existing for:    
      Number                               Total  
      of               Less than       More than       Unrealized  
(Dollars in thousands)     securities       Fair Value       12 months       12 months       Losses  
Mortgage-backed     4     $ 19,806     $ 64     $ —     $ 64  
Corporate debt     1       1,992       8       —       8  
Trust preferred     1       1,428       —       288       288  
Total 6     $ 23,226     $ 72     $ $288     $ 360  

 

    At December 31, 2011
            Continuous Unrealized    
            Losses Existing for:    
      Number                               Total  
      of               Less than       M ore than       Unrealized  
(Dollars in thousands)     securities       Fair Value       12 months       12 months       Losses  
                                         
State and municipal     1     $ 397     $ 2     $ —     $ 2  
Mortgage-backed     3       5,081       13       —       13  
Corporate debt     1       3,326       22       —       22  
Trust preferred     1       2,467       —       480       480  
Total     6     $ 11,271     $ 37     $ 480     $ 517  
Amortized Cost and Estimated Fair Values of Investment Securities

The amortized cost and estimated fair values of investment securities available-for-sale by contractual maturity at the dates indicated are provided in the following table. The Company has allocated mortgage-backed securities into the four maturity groupings reflected in the following table using the expected average life of the individual securities based on statistics provided by independent third party industry sources. Expected maturities will differ from contractual maturities as borrowers may have the right to prepay obligations with or without prepayment penalties.

 

    At September 30, 2012   At December 31, 2011
        Estimated       Estimated
    Amortized   Fair   Amortized   Fair
(In thousands)   Cost   Value   Cost   Value
Due in one year or less   $ 10,275     $ 10,406     $ 65,569     $ 65,972  
Due after one year through five years     32,700       33,600       62,993       64,656  
Due after five years through ten years     368,273       385,574       342,813       354,238  
Due after ten years     385,018       404,362       446,552       466,335  
Total debt securities available for sale   $ 796,266     $ 833,942     $ 917,927     $ 951,201  
Held-to-Maturity Securities
  
Gross Unrealized Losses and Fair Value by Length of Time

Gross unrealized losses and fair value by length of time that the individual held-to-maturity securities have been in a continuous unrealized loss position at the dates indicated are presented in the following tables:

 

  At S eptember 30, 2012
      Continuous Unrealized    
      Losses Existing for:    
  Number             Total
  of     Less than   More than   Unrealized
(Dollars in thousands)     securities       Fair Value       12 months       12 months       Losses  
State and municipal     9     $ 9,913     $ 60     $ —     $ 60  
Total     9     $ 9,913     $ 60     $ —     $ 60  

 

  At December 31, 2011
      Continuous Unrealized    
      Losses Existing for:    
  Number           Total
    of             Less than       More than       Unrealized  
(Dollars in thousands)     securities       Fair Value       12 monhs       12 months       Losses  
State and municipal     1     $ 541     $ 1     $ —     $ 1  
Total     1     $ 541     $ 1     $ —     $ 1  

 
Amortized Cost and Estimated Fair Values of Investment Securities

The amortized cost and estimated fair values of debt securities held-to-maturity by contractual maturity at the dates indicated are reflected in the following table. Expected maturities will differ from contractual maturities as borrowers may have the right to prepay obligations with or without prepayment penalties.

 

    At September 30, 2012   At December 31, 2011
        Estimated       Estimated
    Amortized   Fair   Amortized   Fair
(In thousands)   Cost   Value   Cost   Value
Due in one year or less   $ 10,433     $ 10,635     $ 18,860     $ 19,203  
Due after one year through five years     5,026       5,122       6,937       7,144  
Due after five years through ten years     105,709       108,745       98,428       101,008  
Due after ten years     85,445       88,733       54,240       56,812  
Total debt securities held-to-maturity   $ 206,613     $ 213,235     $ 178,465     $ 184,167