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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 (loss) [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2013   $ 198,240 $ 288,182 $ 1,202,015 $ 24,851 $ (559,360)
Dividend reinvestment plan (shares: 26,843 – 2015; 29,949 - 2014)   60 642      
Stock purchase and compensation plans (shares: 611,076 - 2015; 547,190 - 2014)   1,095 9,528      
Net income $ 47,315     47,315    
Dividends to stockholders ($0.28 per share - 2015; $0.26 per share - 2014)       (14,868)    
Other comprehensive (loss) income 43,161       43,161  
Acquisition of treasury stock (shares: 129,352 - 2015; 124,819 - 2014)           (2,786)
End of period at Jun. 30, 2014 1,238,075 199,395 298,352 1,234,462 68,012 (562,146)
Beginning of year at Dec. 31, 2014 1,275,586 199,896 305,385 1,313,440 19,788 (562,923)
Dividend reinvestment plan (shares: 26,843 – 2015; 29,949 - 2014)   54 677      
Stock purchase and compensation plans (shares: 611,076 - 2015; 547,190 - 2014)   1,222 11,233      
Net income 73,476     73,476    
Dividends to stockholders ($0.28 per share - 2015; $0.26 per share - 2014)       (16,235)    
Other comprehensive (loss) income (32,117)       (32,117)  
Acquisition of treasury stock (shares: 129,352 - 2015; 124,819 - 2014)           (3,583)
End of period at Jun. 30, 2015 $ 1,310,313 $ 201,172 $ 317,295 $ 1,370,681 $ (12,329) $ (566,506)