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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, 2015   $ 201,723 $ 326,656 $ 1,446,192 $ (9,425) $ (567,105)
Dividend reinvestment plan (shares: 15,419 – 2017; 20,808 – 2016)   42 696      
Stock purchase and compensation plans (shares: 515,011 – 2017; 569,034 – 2016)   1,138 12,757      
Net income $ 80,633     80,633    
Dividends to stockholders ($0.32 per share – 2017; $0.30 per share – 2016)       (17,583)    
Other comprehensive income 81,432       81,432  
Acquisition of treasury stock (shares: 134,910 – 2017; 138,007 – 2016)           (4,419)
End of period at Jun. 30, 2016 1,552,737 202,903 340,109 1,509,242 72,007 (571,524)
Beginning of year at Dec. 31, 2016 1,531,370 203,241 347,295 1,568,881 (15,950) (572,097)
Dividend reinvestment plan (shares: 15,419 – 2017; 20,808 – 2016)   31 693      
Stock purchase and compensation plans (shares: 515,011 – 2017; 569,034 – 2016)   1,030 11,994      
Net income 91,866     91,866    
Dividends to stockholders ($0.32 per share – 2017; $0.30 per share – 2016)       (18,927)    
Other comprehensive income 40,447       40,447  
Acquisition of treasury stock (shares: 134,910 – 2017; 138,007 – 2016)           (5,948)
End of period at Jun. 30, 2017 $ 1,652,556 $ 204,302 $ 359,982 $ 1,641,820 $ 24,497 $ (578,045)