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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) income, net of tax
Balance at beginning of period at Dec. 31, 2022   $ 59,885 $ 636,793 $ 133,901 $ 516,371 $ (211,135) $ (93,409)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     3,723        
Lapsed restricted stock units     (3,127)     1,414  
Transfer from retained earnings       12,873      
Net income $ 135,275       135,275    
Cash dividends declared on common stock [1]         (31,307)    
Transfer to legal surplus 12,900       (12,873)    
Stocks repurchased (18,653)         (18,653)  
Lapsed restricted stock units and options     (3,127)     1,414  
Other comprehensive gain (loss), net of tax (34,268)           (34,268)
Balance at end of period at Sep. 30, 2023 1,095,463   637,389 146,774 607,466 (228,374) (127,677)
Balance at beginning of period at Jun. 30, 2023   59,885 636,051 142,567 577,042 (226,230) (89,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     1,354        
Lapsed restricted stock units     (16)     42  
Transfer from retained earnings       4,207      
Net income 44,873       44,873    
Cash dividends declared on common stock [1]         (10,242)    
Transfer to legal surplus 4,200       (4,207)    
Stocks repurchased (2,186)         (2,186)  
Lapsed restricted stock units and options     (16)     42  
Other comprehensive gain (loss), net of tax (38,113)           (38,113)
Balance at end of period at Sep. 30, 2023 1,095,463   637,389 146,774 607,466 (228,374) (127,677)
Balance at beginning of period at Dec. 31, 2023 1,193,480 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     (3,902)     1,681  
Other comprehensive gain (loss), 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     0     0  
Other comprehensive gain (loss), 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)
[1] Dividends declared per common share during the quarter ended September 30, 2024 - $0.25 (September 30, 2023 - $0.22). Dividends declared per common share during the nine-month period ended September 30, 2024 - $0.75 (September 30, 2023 - $0.66).