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Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2011
Premises and Equipment [Abstract]  
Premises and Equipment
Premises and equipment at December 31 are summarized as follows (in thousands):

   
December 31,
 
   
2011
  
2010
 
        
Land
 $73,638  $72,643 
Buildings and improvements
  232,440   226,234 
Software
  82,801   69,303 
Furniture and equipment
  141,743   133,732 
Subtotal
  530,622   501,912 
Less accumulated depreciation
  267,887   236,447 
Total
 $262,735  $265,465