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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2011   $ 194,494 $ 257,370 $ 1,116,319 $ 42,294 $ (552,149)
Dividend reinvestment plan (shares: 33,514 – 2013; 46,603 - 2012)   93 712      
Stock purchase and compensation plans (shares: 682,661 - 2013; 667,500 - 2012)   1,334 7,647      
Net income 18,381     18,381    
Dividends to stockholders ($0.26 per share - 2013 and 2012)       (14,557)    
Other comprehensive (loss) income 16,210       16,210  
Acquisition of treasury stock (shares: 151,113 - 2013; 173,620 - 2012)           (3,102)
End of period at Jun. 30, 2012 1,085,046 195,921 265,729 1,120,143 58,504 (555,251)
Beginning of year at Dec. 31, 2012 1,090,592 196,388 270,654 1,125,154 54,040 (555,644)
Dividend reinvestment plan (shares: 33,514 – 2013; 46,603 - 2012)   67 703      
Stock purchase and compensation plans (shares: 682,661 - 2013; 667,500 - 2012)   1,366 10,657      
Net income 48,430     48,430    
Dividends to stockholders ($0.26 per share - 2013 and 2012)       (14,723)    
Other comprehensive (loss) income (34,762)       (34,762)  
Acquisition of treasury stock (shares: 151,113 - 2013; 173,620 - 2012)           (3,285)
End of period at Jun. 30, 2013 $ 1,099,045 $ 197,821 $ 282,014 $ 1,158,861 $ 19,278 $ (558,929)