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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 (Note 2) | Accounting Standards Update 2016-02 [Member]       $ 342    
Cumulative effect of new accounting principle in period of adoption (Note 2) | 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   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 (Note 2) | Accounting Standards Update 2016-02 [Member]       0    
Cumulative effect of new accounting principle in period of adoption (Note 2) | Accounting Standards Update 2016-13 [Member]       0    
Balance at beginning of year, as adjusted       1,908,119    
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          
Cumulative effect of new accounting principle in period of adoption (Note 2) | Accounting Standards Update 2016-02 [Member]       0    
Cumulative effect of new accounting principle in period of adoption (Note 2) | 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   30 815      
Stock purchase and compensation plans   877 15,683      
Net income 49,419     49,419    
Dividends to stockholders       (27,754)    
Other comprehensive income (loss) 70,216       70,216  
Acquisition of treasury stock           (6,982)
End of period at Jun. 30, 2020 $ 2,298,675 207,875 435,019 2,103,629 151,966 (599,814)
Dividends declared per share to stockholders $ 0.46          
Common stock, shares outstanding, beginning of period at Dec. 31, 2019 59,461,153          
Dividend reinvestment plan, shares 14,874          
Stock purchase and compensation plan, shares 438,601          
Acquisition of treasury stock, shares (102,886)          
Common stock, shares outstanding, end of period at Jun. 30, 2020 59,811,742          
Cumulative effect of new accounting principle in period of adoption (Note 2) | Accounting Standards Update 2016-02 [Member]       0    
Cumulative effect of new accounting principle in period of adoption (Note 2) | Accounting Standards Update 2016-13 [Member]       0    
Balance at beginning of year, as adjusted       2,083,340    
Beginning of year at Mar. 31, 2020   207,665 427,328 2,083,340 (22,117) (599,760)
Dividend reinvestment plan   16 407      
Stock purchase and compensation plans   194 7,284      
Net income $ 34,183     34,183    
Dividends to stockholders       (13,894)    
Other comprehensive income (loss) 174,083       174,083  
Acquisition of treasury stock           (54)
End of period at Jun. 30, 2020 $ 2,298,675 $ 207,875 $ 435,019 $ 2,103,629 $ 151,966 $ (599,814)
Dividends declared per share to stockholders $ 0.23          
Common stock, shares outstanding, beginning of period at Mar. 31, 2020 59,707,545          
Dividend reinvestment plan, shares 7,899          
Stock purchase and compensation plan, shares 97,365          
Acquisition of treasury stock, shares (1,067)          
Common stock, shares outstanding, end of period at Jun. 30, 2020 59,811,742