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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Derivative Financial Instruments [Abstract]  
Notional amounts and estimated fair values of outstanding derivative positions

The notional amounts and estimated fair values of oil and gas derivative positions outstanding are presented in the following table:

 

                                         
          December 31,  
          2012     2011  

Oil and Natural Gas Swaps and Options

  Notional Units     Notional
Amount
    Estimated
Fair
Value
    Notional
Amount
    Estimated
Fair
Value
 
    (Notional amounts and dollars in thousands)  
Oil                                        

Derivative assets

    Barrels       738     $ 2,568       454     $ 4,693  

Derivative liabilities

    Barrels       (738     (1,591     (454     (3,693
           
Natural Gas                                        

Derivative assets

    MMBTUs       4,431     $ 953       3,307     $ 2,389  

Derivative liabilities

    MMBTUs       (4,431     (210     (3,307     (1,727
           

Total Fair Value

  Included in                          

Derivative assets

    Other assets               3,521               7,082  

Derivative liabilities

    Other liabilities               1,801               5,420  
Recognized derivative income included in other noninterest income

The following table is a summary of the Company’s recognized income related to the activity, which was included in other noninterest income:

 

                         
    Year Ended December 31,  
    2012     2011     2010  
    (Dollars in thousands)  

Derivative income

  $  599     $ 569     $ 501  
Summary of the Company's net credit exposure relating to oil and gas swaps

The following table is a summary of the Company’s net credit exposure relating to oil and gas swaps and options with bank counterparties:

 

                 
    December 31,  
    2012     2011  
    (Dollars in thousands)  

Credit exposure

  $  2,410     $ 2,258