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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred stock:
Common stock
Additional paid-in capital:
Retained earnings:
Accumulated other comprehensive income (loss):
Treasury stock:
Beginning of year at Dec. 31, 2021   $ 200,000 $ 208,902 $ 464,347 $ 2,603,472 $ 115,099 $ (608,935)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 1,150            
Dividends declared per common share (in dollars per share) $ 1.14            
Beginning of year (in shares) at Dec. 31, 2021   8,000          
Preferred stock, shares outstanding:              
Issuance of preferred stock, (in shares)   0          
End of year (in shares) at Dec. 31, 2022   8,000          
Beginning of year (in shares) at Dec. 31, 2021     60,184,382        
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     22,093        
Stock purchase and compensation plan (in shares)     374,102        
Acquisition of treasury stock, share repurchase authorization ( in shares)     (165,159)        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (76,518)        
End of year (shares) at Dec. 31, 2022     60,338,900        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
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             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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 1,150            
Dividends declared per common share (in dollars per share) $ 1.25            
Preferred stock, shares outstanding:              
Issuance of preferred stock, (in shares)   0          
End of year (in shares) at Dec. 31, 2023   8,000          
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     18,608        
Stock purchase and compensation plan (in shares)     357,588        
Acquisition of treasury stock, share repurchase authorization ( in shares) 0   0        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (78,659)        
End of year (shares) at Dec. 31, 2023     60,636,437        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of preferred stock   $ 0          
Dividend reinvestment plan     $ 41 1,963      
Stock purchase and compensation plans     731 32,331      
Net income $ 207,012       207,012    
Dividends to preferred stockholders         (9,200)    
Dividends to common stockholders         (87,719)    
Other comprehensive income (loss) 36,156         36,156  
Acquisition of treasury stock - share repurchase authorization (8,700)           (8,689)
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (6,931)
End of year at Dec. 31, 2024 $ 3,120,076 $ 200,000 $ 211,219 $ 557,042 $ 3,139,489 $ (336,845) $ (650,829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 1,150            
Dividends declared per common share (in dollars per share) $ 1.43            
Preferred stock, shares outstanding:              
Issuance of preferred stock, (in shares)   0          
End of year (in shares) at Dec. 31, 2024   8,000          
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     20,598        
Stock purchase and compensation plan (in shares)     365,459        
Acquisition of treasury stock, share repurchase authorization ( in shares) (103,000)   (103,000)        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (71,598)        
End of year (shares) at Dec. 31, 2024     60,847,896