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Bank Premises and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Bank Premises and Equipment  
Summary of bank premises and equipment, by asset classification
  Estimated
useful lives		   2013   2012  
 
    
   (Dollars in Thousands)
  

Bank buildings and improvements

   5 – 40 years   $ 470,386   $ 433,942  

Furniture, equipment and vehicles

   1 – 20 years     260,932     258,222  

Land

         128,805     128,695  

Real estate held for future expansion:

                  

Land, building, furniture, fixture and equipment

   7 – 27 years     511     562  

Less: accumulated depreciation

         (355,792 )   (340,134 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Bank premises and equipment, net

       $ 504,842   $ 481,287  
               
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