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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]
Accumulated other comprehensive income (loss) [Member]
Treasury Stock, Common
Beginning of year at Dec. 31, 2020   $ 200,000 $ 208,066 $ 438,985 $ 2,271,537 $ 220,186 $ (599,885)
Issuance of preferred stock   0          
Dividend reinvestment plan     46 1,707      
Stock purchase and compensation plans     790 23,655      
Net income $ 403,837       403,837    
Dividends to preferred stockholders         (9,353)    
Dividends to common stockholders         (62,549)    
Other comprehensive income (loss) (105,087)         (105,087)  
Acquisition of Treasury Stock - share repurchase authorization             (3,404)
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (5,646)
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 (in dollars per share) $ 1,169.17            
Dividends declared per common share (in dollars per share) $ 1.03            
Preferred stock, shares outstanding, beginning of period at Dec. 31, 2020 8,000            
Issuance of preferred stock, shares   0          
Preferred stock, shares outstanding, end of period at Dec. 31, 2021 8,000            
Common stock, shares outstanding, beginning of period at Dec. 31, 2020 59,905,803            
Dividend reinvestment plan, shares 22,986            
Stock purchase and compensation plan, shares 395,018            
Acquisition of treasury stock, share repurchase authorization, shares (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            
Issuance of preferred stock   $ 0          
Dividend reinvestment plan     44 1,784      
Stock purchase and compensation plans     748 27,357      
Net income $ 224,886       224,886    
Dividends to preferred stockholders         (9,200)    
Dividends to common stockholders         (69,455)    
Other comprehensive income (loss) (613,141)         (613,141)  
Acquisition of Treasury Stock - share repurchase authorization             (12,424)
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (5,920)
End of year at Dec. 31, 2022 $ 2,527,564 $ 200,000 209,694 493,488 2,749,703 (498,042) (627,279)
Dividends declared per preferred share (in dollars per share) $ 1,150            
Dividends declared per common share (in dollars per share) $ 1.14            
Issuance of preferred stock, shares   0          
Preferred stock, shares outstanding, end of period at Dec. 31, 2022 8,000            
Dividend reinvestment plan, shares 22,093            
Stock purchase and compensation plan, shares 374,102            
Acquisition of treasury stock, share repurchase authorization, shares (165,159)            
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (76,518)            
Common stock, shares outstanding, end of period at Dec. 31, 2022 60,338,900            
Issuance of preferred stock   $ 0          
Dividend reinvestment plan     37 1,825      
Stock purchase and compensation plans     716 27,435      
Net income $ 365,238       365,238    
Dividends to preferred stockholders         (9,200)    
Dividends to common stockholders         (76,345)    
Other comprehensive income (loss) 125,041         125,041  
Acquisition of Treasury Stock - share repurchase authorization (12,400)           0
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans             (7,930)
End of year at Dec. 31, 2023 $ 2,954,381 $ 200,000 $ 210,447 $ 522,748 $ 3,029,396 $ (373,001) $ (635,209)
Dividends declared per preferred share (in dollars per share) $ 1,150            
Dividends declared per common share (in dollars per share) $ 1.25            
Issuance of preferred stock, shares   0          
Preferred stock, shares outstanding, end of period at Dec. 31, 2023 8,000            
Dividend reinvestment plan, shares 18,608            
Stock purchase and compensation plan, shares 357,588            
Acquisition of treasury stock, share repurchase authorization, shares 0            
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (78,659)            
Common stock, shares outstanding, end of period at Dec. 31, 2023 60,636,437