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Parent Corporation Balance Sheets (Parenthetical) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale Debt Securities, Amortized Cost $ 3,675,977 $ 3,130,683  
Preferred stock, par value per share $ 0 $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 0 0 0
Preferred stock, shares outstanding 0 0  
Common stock, par value per share $ 2 $ 2  
Common stock, shares authorized 360,000,000 360,000,000  
Common stock, shares issued 99,120,235 98,194,224  
Treasury stock, shares 43,198,622 43,030,776  
Parent Company [Member]
      
Available-for-sale Debt Securities, Amortized Cost $ 55,447 $ 40,701  
Preferred stock, par value per share $ 0 $ 0  
Preferred stock, shares authorized 5,000,000 5,000,000  
Preferred stock, shares issued 0 0  
Preferred stock, shares outstanding 0 0  
Common stock, par value per share $ 2 $ 2  
Common stock, shares authorized 360,000,000 360,000,000  
Common stock, shares issued 99,120,235 98,194,224  
Treasury stock, shares 43,198,622 43,030,776