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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: 17,314 – 2013; 22,916 - 2012)   46 358      
Stock purchase and compensation plans (shares: 496,647 - 2013; 540,322 - 2012)   1,080 4,608      
Net income 18,093     18,093    
Dividends to stockholders ($0.13 per share - 2013 and 2012)       (7,270)    
Other comprehensive income 10,690       10,690  
Acquisition of treasury stock (shares: 146,436 - 2013; 168,614 - 2012)           (3,015)
End of period at Mar. 31, 2012 1,082,918 195,620 262,336 1,127,142 52,984 (555,164)
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: 17,314 – 2013; 22,916 - 2012)   35 349      
Stock purchase and compensation plans (shares: 496,647 - 2013; 540,322 - 2012)   993 5,714      
Net income 21,308     21,308    
Dividends to stockholders ($0.13 per share - 2013 and 2012)       (7,351)    
Other comprehensive income 27,881       27,881  
Acquisition of treasury stock (shares: 146,436 - 2013; 168,614 - 2012)           (3,176)
End of period at Mar. 31, 2013 $ 1,136,345 $ 197,416 $ 276,717 $ 1,139,111 $ 81,921 $ (558,820)