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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 (loss) income [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2014   $ 199,896 $ 305,385 $ 1,313,440 $ 19,788 $ (562,923)
Dividend reinvestment plan (shares: 10,931 – 2016; 13,533 - 2015)   27 346      
Stock purchase and compensation plans (shares: 386,567 - 2016; 469,014 - 2015)   938 7,199      
Net income $ 39,708     39,708    
Dividends to stockholders ($0.15 per share - 2016; $0.14 per share - 2015)       (8,113)    
Other comprehensive income 3,827       3,827  
Acquisition of treasury stock (shares: 122,250 - 2016; 129,257 - 2015)           (3,580)
End of period at Mar. 31, 2015 1,315,938 200,861 312,930 1,345,035 23,615 (566,503)
Beginning of year at Dec. 31, 2015 1,398,041 201,723 326,656 1,446,192 (9,425) (567,105)
Dividend reinvestment plan (shares: 10,931 – 2016; 13,533 - 2015)   22 351      
Stock purchase and compensation plans (shares: 386,567 - 2016; 469,014 - 2015)   773 6,958      
Net income 37,032     37,032    
Dividends to stockholders ($0.15 per share - 2016; $0.14 per share - 2015)       (8,789)    
Other comprehensive income 45,422       45,422  
Acquisition of treasury stock (shares: 122,250 - 2016; 129,257 - 2015)           (3,845)
End of period at Mar. 31, 2016 $ 1,475,965 $ 202,518 $ 333,965 $ 1,474,435 $ 35,997 $ (570,950)