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Bank Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Bank premises and equipment    
Less: accumulated depreciation $ (329,680) $ (313,139)
Bank premises and equipment, net 453,050 468,950
Bank buildings and improvements
    
Bank premises and equipment    
Bank premises and equipment, gross 390,875 388,847
Estimated useful lives, minimum (in years) 5  
Estimated useful lives, maximum (in years) 40  
Furniture, equipment and vehicles
    
Bank premises and equipment    
Bank premises and equipment, gross 266,547 268,590
Estimated useful lives, minimum (in years) 1  
Estimated useful lives, maximum (in years) 20  
Land
    
Bank premises and equipment    
Bank premises and equipment, gross 124,694 123,988
Land, building, furniture, fixture and equipment
    
Bank premises and equipment    
Bank premises and equipment, gross $ 614 $ 664
Estimated useful lives, minimum (in years) 7  
Estimated useful lives, maximum (in years) 27