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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     31 1,448      
Stock purchase and compensation plans     629 25,554      
Net income (loss) $ 111,477       111,477    
Dividends to preferred stockholders         (6,900)    
Dividends to common stockholders         (64,406)    
Other comprehensive income (loss) 161,126         161,126  
Acquisition of treasury stock - share repurchase authorization             (8,689)
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (6,850)
End of period at Sep. 30, 2024 $ 3,167,801 $ 200,000 $ 211,107 549,750 3,069,567 (211,875) (650,748)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 862.50            
Dividends declared per common share (in dollars per share) $ 1.05            
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 Sep. 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)     15,368        
Stock purchase and compensation plan (in shares)     314,776        
Acquisition of treasury stock - share repurchase authorization (in shares)     (103,000)        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (70,750)        
Common stock, shares outstanding, end of period (in shares) at Sep. 30, 2024     60,792,831        
Beginning of period at Jun. 30, 2024   $ 200,000 $ 211,032 545,263 3,001,054 (392,721) (641,937)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of preferred stock   0          
Dividend reinvestment plan     11 476      
Stock purchase and compensation plans     64 4,011      
Net income (loss) $ 92,278       92,278    
Dividends to preferred stockholders         (2,300)    
Dividends to common stockholders         (21,465)    
Other comprehensive income (loss) 180,846         180,846  
Acquisition of treasury stock - share repurchase authorization             (8,689)
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (122)
End of period at Sep. 30, 2024 $ 3,167,801 $ 200,000 $ 211,107 549,750 3,069,567 (211,875) (650,748)
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 Jun. 30, 2024   8,000          
Preferred stock, shares outstanding:              
Issuance of preferred stock (in shares)   0          
Preferred stock, shares outstanding, ending balance (in shares) at Sep. 30, 2024   8,000          
Common stock, shares outstanding, beginning of period (in shares) at Jun. 30, 2024     60,859,948        
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     5,409        
Stock purchase and compensation plan (in shares)     31,848        
Acquisition of treasury stock - share repurchase authorization (in shares)     (103,000)        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (1,374)        
Common stock, shares outstanding, end of period (in shares) at Sep. 30, 2024     60,792,831        
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     37 1,514      
Stock purchase and compensation plans     621 25,869      
Net income (loss) 311,179       311,179    
Dividends to preferred stockholders         (6,900)    
Dividends to common stockholders         (69,863)    
Other comprehensive income (loss) 169,529         169,529  
Acquisition of treasury stock - share repurchase authorization             (55,896)
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (6,204)
End of period at Sep. 30, 2025 $ 3,489,962 $ 200,000 $ 211,877 584,425 3,373,905 (167,316) (712,929)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per preferred share (in dollars per share) $ 862.50            
Dividends declared per common share (in dollars per share) $ 1.14            
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 Sep. 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)     18,690        
Stock purchase and compensation plan (in shares)     310,626        
Acquisition of treasury stock - share repurchase authorization (in shares)     (698,312)        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (72,710)        
Common stock, shares outstanding, end of period (in shares) at Sep. 30, 2025     60,406,190        
Beginning of period at Jun. 30, 2025   $ 200,000 $ 211,832 580,432 3,284,044 (230,642) (676,287)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of preferred stock   0          
Dividend reinvestment plan     13 496      
Stock purchase and compensation plans     32 3,497      
Net income (loss) $ 115,340       115,340    
Dividends to preferred stockholders         (2,300)    
Dividends to common stockholders         (23,179)    
Other comprehensive income (loss) 63,326         63,326  
Acquisition of treasury stock - share repurchase authorization             (36,475)
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans             (167)
End of period at Sep. 30, 2025 $ 3,489,962 $ 200,000 $ 211,877 $ 584,425 $ 3,373,905 $ (167,316) $ (712,929)
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 Jun. 30, 2025   8,000          
Preferred stock, shares outstanding:              
Issuance of preferred stock (in shares)   0          
Preferred stock, shares outstanding, ending balance (in shares) at Sep. 30, 2025   8,000          
Common stock, shares outstanding, beginning of period (in shares) at Jun. 30, 2025     60,849,553        
Common stock, shares outstanding:              
Dividend reinvestment plan (in shares)     6,510        
Stock purchase and compensation plan (in shares)     16,209        
Acquisition of treasury stock - share repurchase authorization (in shares)     (464,701)        
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (in shares)     (1,381)        
Common stock, shares outstanding, end of period (in shares) at Sep. 30, 2025     60,406,190