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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 (loss) income [Member]
Treasury stock [Member]
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member]       $ 0 $ 0  
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member]       0 0  
Cumulative effect adjustment | Accounting Standards Update 2016-02 [Member]       0    
Balance at beginning of year, as adjusted       1,568,881 (15,950)  
Beginning of year at Dec. 31, 2016   $ 203,241 $ 347,295 1,568,881 (15,950) $ (572,097)
Dividend reinvestment plan   57 1,395      
Stock purchase and compensation plans   1,271 19,027      
Net income $ 168,826     168,826    
Dividends to stockholders       (39,094)    
Other comprehensive income (loss) $ 36,120       36,120  
Acquisition of treasury stock           (6,015)
Dividends declared per share to stockholders $ 0.66          
End of year at Dec. 31, 2017 $ 1,712,957 204,569 367,717 1,698,613 20,170 (578,112)
Common Stock, shares outstanding, beginning of period at Dec. 31, 2016 57,967,199          
Dividend reinvestment plan 28,607          
Stock purchase and compensation plan 635,521          
Acquisition of treasury stock (136,205)          
Common Stock, shares outstanding, end of period at Dec. 31, 2017 58,495,122          
Cumulative effect adjustment $ (25,000)       25,019  
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] 0     30,726 (30,726)  
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member]       (5,707) 5,707  
Cumulative effect adjustment | Accounting Standards Update 2016-02 [Member]       0    
Balance at beginning of year, as adjusted       1,723,632 (4,849)  
Dividend reinvestment plan   47 1,379      
Stock purchase and compensation plans   1,081 21,219      
Net income 178,939     178,939    
Dividends to stockholders       (44,157)    
Other comprehensive income (loss) $ (73,107)       (73,107)  
Acquisition of treasury stock           (6,556)
Dividends declared per share to stockholders $ 0.74          
End of year at Dec. 31, 2018 $ 1,791,802 205,697 390,315 1,858,414 (77,956) (584,668)
Dividend reinvestment plan 23,493          
Stock purchase and compensation plan 540,337          
Acquisition of treasury stock (110,398)          
Common Stock, shares outstanding, end of period at Dec. 31, 2018 58,948,554          
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] $ 30,726     0 0  
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member]       0 0  
Balance at beginning of year, as adjusted       1,858,756 (77,956)  
Dividend reinvestment plan   44 1,510      
Stock purchase and compensation plans   1,227 26,696      
Net income 271,623     271,623    
Dividends to stockholders       (49,850)    
Other comprehensive income (loss) $ 159,706       159,706  
Acquisition of treasury stock           (8,164)
Dividends declared per share to stockholders $ 0.83          
End of year at Dec. 31, 2019 $ 2,194,936 $ 206,968 $ 418,521 $ 2,080,529 $ 81,750 $ (592,832)
Dividend reinvestment plan 22,087          
Stock purchase and compensation plan 613,678          
Acquisition of treasury stock (123,166)          
Common Stock, shares outstanding, end of period at Dec. 31, 2019 59,461,153          
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] $ 0