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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     2,368        
Lapsed restricted stock units     (3,110)     1,372  
Transfer from retained earnings       8,666      
Net income $ 90,402       90,402    
Cash dividends declared on common stock [1]         (21,065)    
Transfer to legal surplus 8,700       (8,666)    
Stocks repurchased (16,467)         (16,467)  
Lapsed restricted stock units and options     (3,110)     1,372  
Other comprehensive (loss) gain, net of tax 3,845           3,845
Balance at end of period at Jun. 30, 2023 1,099,751   636,051 142,567 577,042 (226,230) (89,564)
Balance at beginning of period at Mar. 31, 2023   59,885 634,785 138,333 547,641 (212,794) (78,340)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     1,403        
Lapsed restricted stock units     (137)     137  
Transfer from retained earnings       4,234      
Net income 44,173       44,173    
Cash dividends declared on common stock [1]         (10,538)    
Transfer to legal surplus 4,200       (4,234)    
Stocks repurchased (13,573)         (13,573)  
Lapsed restricted stock units and options     (137)     137  
Other comprehensive (loss) gain, net of tax (11,224)           (11,224)
Balance at end of period at Jun. 30, 2023 1,099,751   636,051 142,567 577,042 (226,230) (89,564)
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     3,130        
Lapsed restricted stock units     (3,902)     1,681  
Transfer from retained earnings       9,593      
Net income 100,823       100,823    
Cash dividends declared on common stock [1]         (23,747)    
Transfer to legal surplus 9,600       (9,593)    
Stocks repurchased (24,282)         (24,282)  
Lapsed restricted stock units and options     (3,902)     1,681  
Other comprehensive (loss) gain, net of tax (19,481)           (19,481)
Balance at end of period at Jun. 30, 2024 1,227,702   637,895 160,560 706,807 (250,951) (86,494)
Balance at beginning of period at Mar. 31, 2024   $ 59,885 636,208 155,732 672,455 (226,896) (81,731)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     1,966        
Lapsed restricted stock units     (279)     227  
Transfer from retained earnings       4,828      
Net income 51,131       51,131    
Cash dividends declared on common stock [1]         (11,951)    
Transfer to legal surplus 4,800       (4,828)    
Stocks repurchased (24,282)         (24,282)  
Lapsed restricted stock units and options     (279)     227  
Other comprehensive (loss) gain, net of tax (4,763)           (4,763)
Balance at end of period at Jun. 30, 2024 $ 1,227,702   $ 637,895 $ 160,560 $ 706,807 $ (250,951) $ (86,494)
[1] Dividends declared per common share during the quarter ended June 30, 2024 - $0.25 (June 30, 2023 - $0.22). Dividends declared per common share during the six-month period ended June 30, 2024 - $0.50 (June 30, 2023 - $0.44).