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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional paid-in capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings [Member]
Accounting Standards Update 2016-02 [Member]
Retained Earnings [Member]
Accounting Standards Update 2016-13 [Member]
Accumulated other comprehensive (loss) income [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2018   $ 0 $ 205,697 $ 390,315 $ 1,858,414 $ 1,858,756 $ 342 $ 0 $ (77,956) $ (584,668)
Dividend reinvestment plan     44 1,510            
Preferred stock issuance costs       0            
Preferred stock issuance costs   0                
Stock purchase and compensation plans     1,227 26,696            
Net income $ 271,623       271,623          
Dividends, Preferred Stock, Cash         0          
Dividends to common stockholders         (49,850)          
Other comprehensive (loss) income 159,706               159,706  
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans                   0
End of year at Dec. 31, 2019 $ 2,194,936 $ 0 206,968 418,521 2,080,529 2,081,964 0 1,435 81,750 (592,832)
Dividends declared per preferred share $ 0                  
Dividends declared per common share $ 0.83                  
Preferred stock, shares outstanding, beginning of period at Dec. 31, 2018 0                  
Preferred stock, shares outstanding, ending of period at Dec. 31, 2019 0                  
Preferred Stock, Shares Issued   0                
Common Stock, shares outstanding, beginning of period at Dec. 31, 2018 58,948,554                  
Dividend reinvestment plan 22,087                  
Stock purchase and compensation plan 613,678                  
Acquisition of treasury stock 0                  
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 123,166                  
Common Stock, shares outstanding, end of period at Dec. 31, 2019 59,461,153                  
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation                   (8,164)
Dividend reinvestment plan     58 1,645            
Preferred stock issuance costs       (5,416)            
Preferred stock issuance costs   $ 200,000                
Stock purchase and compensation plans     1,040 24,235            
Net income $ 246,355       246,355          
Dividends, Preferred Stock, Cash         0          
Dividends to common stockholders         (56,782)          
Other comprehensive (loss) income 138,436               138,436  
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans                   0
End of year at Dec. 31, 2020 $ 2,738,889 $ 200,000 208,066 438,985 2,271,537 $ 2,271,537 $ 0 $ 0 220,186 (599,885)
Dividends declared per preferred share $ 0                  
Dividends declared per common share $ 0.94                  
Preferred stock, shares outstanding, ending of period at Dec. 31, 2020 8,000                  
Preferred Stock, Shares Issued   8,000                
Dividend reinvestment plan 28,890                  
Stock purchase and compensation plan 519,863                  
Acquisition of treasury stock 0                  
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 104,103                  
Common Stock, shares outstanding, end of period at Dec. 31, 2020 59,905,803                  
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation                   (7,053)
Dividend reinvestment plan     46 1,707            
Preferred stock issuance costs       0            
Preferred stock issuance costs   $ 0                
Stock purchase and compensation plans     790 23,655            
Net income $ 403,837       403,837          
Dividends, Preferred Stock, Cash         9,353          
Dividends to common stockholders         (62,549)          
Other comprehensive (loss) income (105,087)               (105,087)  
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (3,400)                 (3,404)
End of year at Dec. 31, 2021 $ 2,982,885 $ 200,000 $ 208,902 $ 464,347 $ 2,603,472       $ 115,099 (608,935)
Dividends declared per preferred share $ 1,169.17                  
Dividends declared per common share $ 1.03                  
Preferred stock, shares outstanding, ending of period at Dec. 31, 2021 8,000                  
Preferred Stock, Shares Issued   0                
Dividend reinvestment plan 22,986                  
Stock purchase and compensation plan 395,018                  
Acquisition of treasury stock (52,781)                  
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 86,644                  
Common Stock, shares outstanding, end of period at Dec. 31, 2021 60,184,382                  
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation                   $ (5,646)