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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2023 $ 3,803,661 $ 309,513 $ 1,739,671 $ 2,375,604 $ (621,127)
Balance, Shares Issued at Dec. 31, 2023   92,947      
Net income 338,741        
Net Income (Loss) 338,741     338,741  
Other comprehensive income 145,631       145,631
Comprehensive income 484,372        
Cash dividends declared (96,890)     (96,890)  
Common stock activity, long-term incentive plans 10,422   10,293 129  
Issuance of stock from dividend reinvestment and stock purchase plans 3,095   3,095    
Repurchase of common stock (29,973)   (29,973)    
Balance at Sep. 30, 2024 4,174,687 $ 309,513 1,723,086 2,617,584 (475,496)
Balance, Shares Issued at Sep. 30, 2024   92,947      
Balance at Jun. 30, 2024 3,920,718 $ 309,513 1,732,084 2,537,057 (657,936)
Balance, Shares Issued at Jun. 30, 2024   92,947      
Net income 115,572        
Net Income (Loss) 115,572     115,572  
Other comprehensive income 182,440       182,440
Comprehensive income 298,012        
Cash dividends declared (35,089)     (35,089)  
Common stock activity, long-term incentive plans 5,320   5,276 44  
Issuance of stock from dividend reinvestment and stock purchase plans 1,077   1,077    
Repurchase of common stock (15,351)   (15,351)    
Balance at Sep. 30, 2024 4,174,687 $ 309,513 1,723,086 2,617,584 (475,496)
Balance, Shares Issued at Sep. 30, 2024   92,947      
Balance at Dec. 31, 2024 $ 4,127,636 $ 309,513 1,719,609 2,704,606 (606,092)
Balance, Shares Issued at Dec. 31, 2024 92,947 92,947      
Net income $ 360,501        
Net Income (Loss) 360,501     360,501  
Other comprehensive income 189,632       189,632
Comprehensive income 550,133        
Cash dividends declared (117,385)     (117,385)  
Common stock activity, long-term incentive plans 11,673   11,643 30  
Issuance of stock from dividend reinvestment and stock purchase plans 3,352   3,352    
Repurchase of common stock (100,930)   (100,930)    
Balance at Sep. 30, 2025 $ 4,474,479 $ 309,513 1,633,674 2,947,752 (416,460)
Balance, Shares Issued at Sep. 30, 2025 92,947 92,947      
Balance at Jun. 30, 2025 $ 4,365,419 $ 309,513 1,666,695 2,859,038 (469,827)
Balance, Shares Issued at Jun. 30, 2025   92,947      
Net income 127,466        
Net Income (Loss) 127,466     127,466  
Other comprehensive income 53,367       53,367
Comprehensive income 180,833        
Cash dividends declared (38,771)     (38,771)  
Common stock activity, long-term incentive plans 6,324   6,305 19  
Issuance of stock from dividend reinvestment and stock purchase plans 1,140   1,140    
Repurchase of common stock (40,466)   (40,466)    
Balance at Sep. 30, 2025 $ 4,474,479 $ 309,513 $ 1,633,674 $ 2,947,752 $ (416,460)
Balance, Shares Issued at Sep. 30, 2025 92,947 92,947