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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]
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]       $ 342    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-13 [Member]       0    
Balance at beginning of year, as adjusted       1,858,756    
Beginning of year at Dec. 31, 2018   $ 205,697 $ 390,315 1,858,414 $ (77,956) $ (584,668)
Dividend reinvestment plan   11 365      
Stock purchase and compensation plans   743 8,201      
Net income $ 61,348     61,348    
Dividends to stockholders       (11,985)    
Other comprehensive (loss) income 80,980       80,980  
Acquisition of treasury stock           (6,585)
End of period at Mar. 31, 2019 $ 1,925,222 206,451 398,881 1,908,119 3,024 (591,253)
Dividends declared per share to stockholders $ 0.20          
Common stock, shares outstanding, beginning of period at Dec. 31, 2018 58,948,554          
Dividend reinvestment plan, shares 5,694          
Stock purchase and compensation plan, shares 371,628          
Acquisition of treasury stock, shares (102,971)          
Common stock, shares outstanding, end of period at Mar. 31, 2019 59,222,905          
Cumulative effect of new accounting principle in period of adoption $ 1,435          
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]       0    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-13 [Member]       1,435    
Balance at beginning of year, as adjusted       2,081,964    
Beginning of year at Dec. 31, 2019 2,194,936 206,968 418,521 2,080,529 81,750 (592,832)
Dividend reinvestment plan   14 408      
Stock purchase and compensation plans   683 8,399      
Net income 15,236     15,236    
Dividends to stockholders       (13,860)    
Other comprehensive (loss) income (103,867)       (103,867)  
Acquisition of treasury stock           (6,928)
End of period at Mar. 31, 2020 $ 2,096,456 $ 207,665 $ 427,328 $ 2,083,340 $ (22,117) $ (599,760)
Dividends declared per share to stockholders $ 0.23          
Common stock, shares outstanding, beginning of period at Dec. 31, 2019 59,461,153          
Dividend reinvestment plan, shares 6,975          
Stock purchase and compensation plan, shares 341,236          
Acquisition of treasury stock, shares (101,819)          
Common stock, shares outstanding, end of period at Mar. 31, 2020 59,707,545