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Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2012
Derivative Financial Instruments [Abstract]  
Notional amounts and estimated fair values of outstanding derivative positions
                     
    September 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     724     $ 3,464  

Derivative liabilities

  Barrels     (724     (1,948

Natural Gas

                   

Derivative assets

  MMBTUs     4,227       1,424  

Derivative liabilities

  MMBTUs     (4,227     (633

Total Fair Value

  Included in                

Derivative assets

  Other assets             4,175  

Derivative liabilities

  Other liabilities             (1,868
Recognized derivative income included in other noninterest income
                                 
    Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
    2012     2011     2012     2011  
    (Dollars in thousands)  

Derivative income

  $  205     $ 128     $ 555     $ 326  
Summary of the Company's net credit exposure relating to oil and gas swaps
         
    September 30, 2012  
    (Dollars in thousands)  

Credit exposure

  $  3,619