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Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Other intangible assets [Abstract]  
Changes in the carrying amount of core deposit intangibles
                 
    2012     2011  

Core Deposit Intangible:

                

Balance as of January 1,

   $ 38,196     $ 53,208  

Amortization expense

     6,962       15,012  

Asset disposal

     31,234       —    
   

 

 

    

 

 

  

Balance as of December 31,

     —         38,196  
   

 

 

    

 

 

  

Total other intangible assets

   $ —       $ 38,196