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Derivative Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Financial Instruments [Abstract]  
Notional amounts and estimated fair values of outstanding derivative positions
                     
    June 30, 2012  

Oil and Natural Gas Swaps and Options

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

Derivative assets

  Barrels     633     $ 5,062  

Derivative liabilities

  Barrels     (633     (3,838
Natural Gas                    

Derivative assets

  MMBTUs     4,627       2,590  

Derivative liabilities

  MMBTUs     (4,627     (1,810

Total Fair Value

  Included in                
   

 

               

Derivative assets

  Other assets             7,652  

Derivative liabilities

  Other liabilities             5,648  
Recognized derivative income included in other noninterest income
                                 
    Three Months Ended
June  30,
    Six Months Ended
June  30,
 
    2012     2011     2012     2011  
    (Dollars in thousands)  

Derivative income

  $  141     $  74     $  350     $  198  
Summary of the Company's net credit exposure relating to oil and gas swaps
         
    June 30, 2012  
    (Dollars in
thousands)
 

Credit exposure

  $  7,201