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Segment Information
 9 Months Ended
Sep. 30, 2012
Segment Information [Abstract]  
SEGMENT INFORMATION
(12) SEGMENT INFORMATION

The Company evaluates its performance with an internal profitability measurement system that measures the profitability of its business units on a pre-tax basis. The four principal business units are metropolitan banks, community banks, other financial services, and executive, operations and support. Metropolitan and community banks offer traditional banking products such as commercial and retail lending, and a full line of deposit accounts. Metropolitan banks consist of banking locations in the metropolitan Oklahoma City and Tulsa areas. Community banks consist of banking locations in communities throughout Oklahoma. Other financial services are specialty product business units including guaranteed small business lending, residential mortgage lending, trust services, securities brokerage, electronic banking and insurance. The executive, operations and support groups represent executive management, operational support and corporate functions that are not allocated to the other business units.

The results of operations and selected financial information for the four business units are as follows:

 

                                                 
                Other     Executive,              
    Metropolitan     Community     Financial     Operations     Elimin-     Consol-  
    Banks     Banks     Services     & Support     ations     idated  
    (Dollars in thousands)  

Three Months Ended September 30, 2012

  

                                        

Net interest income (expense)

   $ 13,267     $ 26,302     $ 1,777     $ (514 )    $ —       $ 40,832  

Noninterest income

     2,840       11,153       7,404       14,881       (14,162 )      22,116  

Income before taxes

     8,302       15,234       3,266       7,463       (14,015 )      20,250  
           

Three Months Ended September 30, 2011

  

                                        

Net interest income (expense)

   $ 13,167     $ 26,518     $ 1,620     $ (1,087 )    $ —       $ 40,218  

Noninterest income

     2,979       10,607       5,845       13,897       (13,211 )      20,117  

Income before taxes

     7,612       14,867       2,217       6,557       (13,062 )      18,191  
           

Nine Months Ended September 30, 2012

  

                                        

Net interest income (expense)

   $ 39,784     $ 79,317     $ 5,211     $ (1,794 )    $ —       $ 122,518  

Noninterest income

     8,193       32,009       23,482       43,507       (41,274 )      65,917  

Income before taxes

     24,954       45,433       11,664       19,682       (41,017 )      60,716  
           

Nine Months Ended September 30, 2011

  

                                        

Net interest income (expense)

   $ 37,650     $ 75,576     $ 5,349     $ (3,062 )    $ —       $ 115,513  

Noninterest income

     8,491       29,292       17,448       38,139       (35,844 )      57,526  

Income before taxes

     22,492       41,703       7,849       15,647       (35,604 )      52,087  
           

Total Assets:

  

                                        

September 30, 2012

   $ 1,892,444     $ 3,745,727     $ 126,704     $ 636,853     $ (564,977 )    $ 5,836,751  

December 31, 2011

   $ 1,738,426     $ 3,660,239     $ 153,872     $ 602,577     $ (546,289 )    $ 5,608,825  

September 30, 2011

   $ 1,660,756     $ 3,615,387     $ 134,984     $ 612,535     $ (551,356 )    $ 5,472,306  

The financial information for each business unit is presented on the basis used internally by management to evaluate performance and allocate resources. The Company utilizes a transfer pricing system to allocate the benefit or cost of funds provided or used by the various business units. Certain services provided by the support group to other business units, such as item processing, are allocated at rates approximating the cost of providing the services. Eliminations are adjustments to consolidate the business units and companies. Capital expenditures are generally charged to the business unit using the asset.