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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   35 1,013      
Stock purchase and compensation plans   969 16,721      
Net income $ 133,179     133,179    
Dividends to stockholders       (32,204)    
Other comprehensive income (loss) (87,727)       (87,727)  
Acquisition of treasury stock           (6,423)
End of period at Sep. 30, 2018 $ 1,738,520 205,573 385,451 1,824,607 (92,576) (584,535)
Dividends declared per share to stockholders $ 0.54          
Common stock, shares outstanding, beginning of period at Dec. 31, 2017 58,495,122          
Dividend reinvestment plan, shares 17,683          
Stock purchase and compensation plan, shares 484,491          
Acquisition of treasury stock, shares (108,311)          
Common stock, shares outstanding, end of period at Sep. 30, 2018 58,888,985          
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       1,779,928 (84,517)  
Beginning of year at Jun. 30, 2018   205,460 381,641 1,779,928 (84,517) (584,357)
Dividend reinvestment plan   10 327      
Stock purchase and compensation plans   103 3,483      
Net income $ 55,435     55,435    
Dividends to stockholders       (10,756)    
Other comprehensive income (loss) (8,059)       (8,059)  
Acquisition of treasury stock           (178)
End of period at Sep. 30, 2018 $ 1,738,520 205,573 385,451 1,824,607 (92,576) (584,535)
Dividends declared per share to stockholders $ 0.18          
Common stock, shares outstanding, beginning of period at Jun. 30, 2018 58,835,052          
Dividend reinvestment plan, shares 5,310          
Stock purchase and compensation plan, shares 51,482          
Acquisition of treasury stock, shares (2,859)          
Common stock, shares outstanding, end of period at Sep. 30, 2018 58,888,985          
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   31 1,095      
Stock purchase and compensation plans   1,115 20,937      
Net income 189,764     189,764    
Dividends to stockholders       (36,021)    
Other comprehensive income (loss) 176,382       176,382  
Acquisition of treasury stock           (8,071)
End of period at Sep. 30, 2019 $ 2,137,376 206,843 412,347 2,012,499 98,426 (592,739)
Dividends declared per share to stockholders $ 0.60          
Common stock, shares outstanding, beginning of period at Dec. 31, 2018 58,948,554          
Dividend reinvestment plan, shares 15,650          
Stock purchase and compensation plan, shares 557,257          
Acquisition of treasury stock, shares (121,892)          
Common stock, shares outstanding, end of period at Sep. 30, 2019 59,399,569          
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  
Balance at beginning of year, as adjusted       1,968,374 68,506  
Beginning of year at Jun. 30, 2019   206,665 407,382 1,968,374 68,506 (591,383)
Dividend reinvestment plan   9 366      
Stock purchase and compensation plans   169 4,599      
Net income $ 56,150     56,150    
Dividends to stockholders       (12,025)    
Other comprehensive income (loss) 29,920       29,920  
Acquisition of treasury stock           (1,356)
End of period at Sep. 30, 2019 $ 2,137,376 $ 206,843 $ 412,347 2,012,499 $ 98,426 $ (592,739)
Dividends declared per share to stockholders $ 0.20          
Common stock, shares outstanding, beginning of period at Jun. 30, 2019 59,328,108          
Dividend reinvestment plan, shares 4,738          
Stock purchase and compensation plan, shares 83,979          
Acquisition of treasury stock, shares (17,256)          
Common stock, shares outstanding, end of period at Sep. 30, 2019 59,399,569          
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]       $ 0