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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, 2012   $ 196,388 $ 270,654 $ 1,125,154 $ 54,040 $ (555,644)
Dividend reinvestment plan (shares:15,283 – 2014; 17,314 - 2013)   35 349      
Stock purchase and compensation plans (shares: 401,179 - 2014; 496,647 - 2013)   993 5,714      
Net income 21,308     21,308    
Dividends to stockholders ($0.13 per share - 2014 and 2013)       (7,351)    
Other comprehensive income         27,881  
Acquisition of treasury stock (shares: 118,876- 2014; 146,436 - 2013)           (3,176)
End of period at Mar. 31, 2013 1,136,345 197,416 276,717 1,139,111 81,921 (558,820)
Beginning of year at Dec. 31, 2013 1,153,928 198,240 288,182 1,202,015 24,851 (559,360)
Dividend reinvestment plan (shares:15,283 – 2014; 17,314 - 2013)   31 320      
Stock purchase and compensation plans (shares: 401,179 - 2014; 496,647 - 2013)   802 5,863      
Net income 17,974     17,974    
Dividends to stockholders ($0.13 per share - 2014 and 2013)       (7,412)    
Other comprehensive income         16,678  
Acquisition of treasury stock (shares: 118,876- 2014; 146,436 - 2013)           (2,653)
End of period at Mar. 31, 2014 $ 1,185,531 $ 199,073 $ 294,365 $ 1,212,577 $ 41,529 $ (562,013)