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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 year at Dec. 31, 2021   $ 59,885 $ 637,061 $ 117,677 $ 399,949 $ (150,572) $ 5,160
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     2,915        
Lapsed restricted stock units     (4,453)     3,544  
Transfer from retained earnings       11,752      
Net income $ 119,872       119,872    
Cash dividends declared on common stock [1]         (24,012)    
Stocks repurchased (64,110)         (64,110)  
Transfer to legal surplus         (11,752)    
Other comprehensive loss, net of tax (109,049)           (109,049)
Balance at end of year at Sep. 30, 2022 993,867 59,885 635,523 129,429 484,057 (211,138) (103,889)
Balance at beginning of year at Jun. 30, 2022   59,885 634,612 125,365 455,590 (211,138) (49,502)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     911        
Lapsed restricted stock units     0     0  
Transfer from retained earnings       4,064      
Net income 41,919       41,919    
Cash dividends declared on common stock [1]         (9,388)    
Stocks repurchased           0  
Transfer to legal surplus         (4,064)    
Other comprehensive loss, net of tax (54,387)           (54,387)
Balance at end of year at Sep. 30, 2022 993,867 59,885 635,523 129,429 484,057 (211,138) (103,889)
Balance at beginning of year at Dec. 31, 2022 1,042,406 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)    
Stocks repurchased (18,653)         (18,653)  
Transfer to legal surplus 12,900       (12,873)    
Other comprehensive loss, net of tax (34,268)           (34,268)
Balance at end of year at Sep. 30, 2023 1,095,463 59,885 637,389 146,774 607,466 (228,374) (127,677)
Balance at beginning of year 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)    
Stocks repurchased           (2,186)  
Transfer to legal surplus         (4,207)    
Other comprehensive loss, net of tax (38,113)           (38,113)
Balance at end of year at Sep. 30, 2023 $ 1,095,463 $ 59,885 $ 637,389 $ 146,774 $ 607,466 $ (228,374) $ (127,677)
[1] Dividends declared per common share during the quarter ended September 30, 2023 - $0.22 (September 30, 2022 - $0.20). Dividends declared per common share during the nine-month period ended September 30, 2023 - $0.66 (September 30, 2022 - $0.50).