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Unaudited 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 period at Dec. 31, 2023   $ 200,000 $ 210,447 $ 522,748 $ 3,029,396 $ (373,001) $ (635,209)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of preferred stock   0          
Dividend reinvestment plan     20 972      
Stock purchase and compensation plans     565 21,543      
Net income (loss) $ 19,199       19,199    
Dividends to preferred stockholders         (4,600)    
Dividends to common stockholders         (42,941)    
Other comprehensive income (loss) (19,720)         (19,720)  
Acquisition of treasury stock - share repurchase authorization             0
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (6,728)
End of period at Jun. 30, 2024 $ 2,922,691 $ 200,000 $ 211,032 545,263 3,001,054 (392,721) (641,937)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 575.00            
Dividends declared per common share (in dollars per share) $ 0.70            
Preferred stock, shares outstanding, beginning balance (in shares) at Dec. 31, 2023   8,000          
Preferred stock, shares outstanding:              
Issuance of preferred stock (in shares)   0          
Preferred stock, shares outstanding, ending balance (in shares) at Jun. 30, 2024   8,000          
Common stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2023     60,636,437        
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     9,959        
Stock purchase and compensation plan (in shares)     282,928        
Acquisition of treasury stock - share repurchase authorization (in shares)     0        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (69,376)        
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2024     60,859,948        
Beginning of period at Mar. 31, 2024   $ 200,000 $ 210,895 534,327 3,088,150 (384,972) (641,906)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of preferred stock   0          
Dividend reinvestment plan     10 484      
Stock purchase and compensation plans     127 10,452      
Net income (loss) $ (63,319)       (63,319)    
Dividends to preferred stockholders         (2,300)    
Dividends to common stockholders         (21,477)    
Other comprehensive income (loss) (7,749)         (7,749)  
Acquisition of treasury stock - share repurchase authorization             0
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (31)
End of period at Jun. 30, 2024 $ 2,922,691 $ 200,000 $ 211,032 545,263 3,001,054 (392,721) (641,937)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 287.50            
Dividends declared per common share (in dollars per share) $ 0.35            
Preferred stock, shares outstanding, beginning balance (in shares) at Mar. 31, 2024   8,000          
Preferred stock, shares outstanding:              
Issuance of preferred stock (in shares)   0          
Preferred stock, shares outstanding, ending balance (in shares) at Jun. 30, 2024   8,000          
Common stock, shares outstanding, beginning of period (in shares) at Mar. 31, 2024     60,791,439        
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     5,153        
Stock purchase and compensation plan (in shares)     63,664        
Acquisition of treasury stock - share repurchase authorization (in shares)     0        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (308)        
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2024     60,859,948        
Beginning of period 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]              
Issuance of preferred stock   0          
Dividend reinvestment plan     24 1,018      
Stock purchase and compensation plans     589 22,372      
Net income (loss) 195,839       195,839    
Dividends to preferred stockholders         (4,600)    
Dividends to common stockholders         (46,684)    
Other comprehensive income (loss) 106,203         106,203  
Acquisition of treasury stock - share repurchase authorization (19,400)           (19,421)
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (6,037)
End of period at Jun. 30, 2025 $ 3,369,379 $ 200,000 $ 211,832 580,432 3,284,044 (230,642) (676,287)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 575.00            
Dividends declared per common share (in dollars per share) $ 0.76            
Preferred stock, shares outstanding, beginning balance (in shares) at Dec. 31, 2024   8,000          
Preferred stock, shares outstanding:              
Issuance of preferred stock (in shares)   0          
Preferred stock, shares outstanding, ending balance (in shares) at Jun. 30, 2025   8,000          
Common stock, shares outstanding, beginning of period (in shares) at Dec. 31, 2024     60,847,896        
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     12,180        
Stock purchase and compensation plan (in shares)     294,417        
Acquisition of treasury stock - share repurchase authorization (in shares) (233,611)   (233,611)        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (71,329)        
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2025     60,849,553        
Beginning of period at Mar. 31, 2025   $ 200,000 $ 211,673 571,289 3,223,731 (272,068) (676,085)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of preferred stock   0          
Dividend reinvestment plan     12 510      
Stock purchase and compensation plans     147 8,633      
Net income (loss) $ 85,943       85,943    
Dividends to preferred stockholders         (2,300)    
Dividends to common stockholders         (23,330)    
Other comprehensive income (loss) 41,426         41,426  
Acquisition of treasury stock - share repurchase authorization             0
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (202)
End of period at Jun. 30, 2025 $ 3,369,379 $ 200,000 $ 211,832 $ 580,432 $ 3,284,044 $ (230,642) $ (676,287)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 287.50            
Dividends declared per common share (in dollars per share) $ 0.38            
Preferred stock, shares outstanding, beginning balance (in shares) at Mar. 31, 2025   8,000          
Preferred stock, shares outstanding:              
Issuance of preferred stock (in shares)   0          
Preferred stock, shares outstanding, ending balance (in shares) at Jun. 30, 2025   8,000          
Common stock, shares outstanding, beginning of period (in shares) at Mar. 31, 2025     60,772,988        
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     5,973        
Stock purchase and compensation plan (in shares)     73,561        
Acquisition of treasury stock - share repurchase authorization (in shares)     0        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (2,969)        
Common stock, shares outstanding, end of period (in shares) at Jun. 30, 2025     60,849,553