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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 2016-01 [Member]       $ 30,726 $ (30,726)  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]       (5,707) 5,707  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]       0    
Balance at beginning of year, as adjusted       1,723,632 (4,849)  
Beginning of year at Dec. 31, 2017   $ 204,569 $ 367,717 1,698,613 20,170 $ (578,112)
Dividend reinvestment plan   25 686      
Stock purchase and compensation plans   866 13,238      
Net income $ 77,744     77,744    
Dividends to stockholders       (21,448)    
Other comprehensive income (loss) (79,668)       (79,668)  
Acquisition of treasury stock           (6,245)
End of period at Jun. 30, 2018 $ 1,698,155 205,460 381,641 1,779,928 (84,517) (584,357)
Dividends declared per share to stockholders $ 0.36          
Common stock, shares outstanding, beginning of period at Dec. 31, 2017 58,495,122          
Dividend reinvestment plan, shares 12,373          
Stock purchase and compensation plan, shares 433,009          
Acquisition of treasury stock, shares (105,452)          
Common stock, shares outstanding, end of period at Jun. 30, 2018 58,835,052          
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]       0 0  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]       0 0  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]       0    
Balance at beginning of year, as adjusted       1,731,832 (68,243)  
Beginning of year at Mar. 31, 2018   205,280 375,155 1,731,832 (68,243) (584,228)
Dividend reinvestment plan   12 333      
Stock purchase and compensation plans   168 6,153      
Net income $ 58,819     58,819    
Dividends to stockholders       (10,723)    
Other comprehensive income (loss) (16,274)       (16,274)  
Acquisition of treasury stock           (129)
End of period at Jun. 30, 2018 $ 1,698,155 205,460 381,641 1,779,928 (84,517) (584,357)
Dividends declared per share to stockholders $ 0.18          
Common stock, shares outstanding, beginning of period at Mar. 31, 2018 58,747,505          
Dividend reinvestment plan, shares 6,075          
Stock purchase and compensation plan, shares 83,754          
Acquisition of treasury stock, shares (2,282)          
Common stock, shares outstanding, end of period at Jun. 30, 2018 58,835,052          
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]       0 0  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]       0 0  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]       342    
Balance at beginning of year, as adjusted       1,858,756 (77,956)  
Beginning of year at Dec. 31, 2018 $ 1,791,802 205,697 390,315 1,858,414 (77,956) (584,668)
Dividend reinvestment plan   22 729      
Stock purchase and compensation plans   946 16,338      
Net income 133,614     133,614    
Dividends to stockholders       (23,996)    
Other comprehensive income (loss) 146,462       146,462  
Acquisition of treasury stock           (6,715)
End of period at Jun. 30, 2019 $ 2,059,544 206,665 407,382 1,968,374 68,506 (591,383)
Dividends declared per share to stockholders $ 0.40          
Common stock, shares outstanding, beginning of period at Dec. 31, 2018 58,948,554          
Dividend reinvestment plan, shares 10,912          
Stock purchase and compensation plan, shares 473,278          
Acquisition of treasury stock, shares (104,636)          
Common stock, shares outstanding, end of period at Jun. 30, 2019 59,328,108          
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]       0 0  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]       0 0  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]       0    
Balance at beginning of year, as adjusted       1,908,119 3,024  
Beginning of year at Mar. 31, 2019   206,451 398,881 1,908,119 3,024 (591,253)
Dividend reinvestment plan   11 364      
Stock purchase and compensation plans   203 8,137      
Net income $ 72,266     72,266    
Dividends to stockholders       (12,011)    
Other comprehensive income (loss) 65,482       65,482  
Acquisition of treasury stock           (130)
End of period at Jun. 30, 2019 $ 2,059,544 $ 206,665 $ 407,382 $ 1,968,374 $ 68,506 $ (591,383)
Dividends declared per share to stockholders $ 0.20          
Common stock, shares outstanding, beginning of period at Mar. 31, 2019 59,222,905          
Dividend reinvestment plan, shares 5,218          
Stock purchase and compensation plan, shares 101,650          
Acquisition of treasury stock, shares (1,665)          
Common stock, shares outstanding, end of period at Jun. 30, 2019 59,328,108