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UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Common stock:
Additional paid-in capital:
Legal surplus:
Retained earnings:
Treasury stock:
Accumulated other comprehensive loss, net of tax:
Balance at beginning of period at Dec. 31, 2023   $ 59,885 $ 638,667 $ 150,967 $ 639,324 $ (228,350) $ (67,013)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     4,722        
Lapsed restricted stock units     (3,902)     1,681  
Transfer from retained earnings       14,023      
Net income $ 147,823       147,823    
Cash dividends declared on common stock [1]         (35,309)    
Transfer to legal surplus 14,000       (14,023)    
Stocks repurchased (24,386)         (24,386)  
Lapsed restricted stock units and options, net of employee award repurchased     (3,902)     1,681  
Other comprehensive gain, net of tax 34,023           34,023
Balance at end of period at Sep. 30, 2024 1,318,132   639,487 164,990 737,815 (251,055) (32,990)
Balance at beginning of period at Jun. 30, 2024   59,885 637,895 160,560 706,807 (250,951) (86,494)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     1,592        
Lapsed restricted stock units     0     0  
Transfer from retained earnings       4,430      
Net income 47,000       47,000    
Cash dividends declared on common stock [1]         (11,562)    
Transfer to legal surplus 4,400       (4,430)    
Stocks repurchased (104)         (104)  
Lapsed restricted stock units and options, net of employee award repurchased     0     0  
Other comprehensive gain, net of tax 53,504           53,504
Balance at end of period at Sep. 30, 2024 1,318,132   639,487 164,990 737,815 (251,055) (32,990)
Balance at beginning of period at Dec. 31, 2024 1,254,371 59,885 639,786 169,537 771,993 (296,991) (89,839)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     4,612        
Lapsed restricted stock units     (3,048)     (480)  
Transfer from retained earnings       14,077      
Net income 149,210       149,210    
Cash dividends declared on common stock [1]         (40,300)    
Transfer to legal surplus 14,100       (14,077)    
Stocks repurchased (51,486)         (51,486)  
Lapsed restricted stock units and options, net of employee award repurchased     (3,048)     (480)  
Other comprehensive gain, net of tax 62,538           62,538
Balance at end of period at Sep. 30, 2025 1,375,417   641,350 183,614 866,826 (348,957) (27,301)
Balance at beginning of period at Jun. 30, 2025   $ 59,885 639,901 178,834 833,187 (328,572) (48,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     1,462        
Lapsed restricted stock units     (13)     13  
Transfer from retained earnings       4,780      
Net income 51,838       51,838    
Cash dividends declared on common stock [1]         (13,419)    
Transfer to legal surplus 4,800       (4,780)    
Stocks repurchased (20,398)         (20,398)  
Lapsed restricted stock units and options, net of employee award repurchased     (13)     13  
Other comprehensive gain, net of tax 21,481           21,481
Balance at end of period at Sep. 30, 2025 $ 1,375,417   $ 641,350 $ 183,614 $ 866,826 $ (348,957) $ (27,301)
[1] Dividends declared per common share during the quarter ended September 30, 2025 - $0.30 (September 30, 2024 - $0.25). Dividends declared per common share during the nine-month period ended September 30, 2025 - $0.90 (September 30, 2024 - $0.75).