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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     2,004        
Lapsed restricted stock units     (4,453)     3,544  
Transfer from retained earnings       7,688      
Net income $ 77,953       77,953    
Cash dividends declared on common stock [1]         (14,624)    
Stocks repurchased (64,110)         (64,110)  
Transfer to legal surplus         (7,688)    
Other comprehensive (loss) income, net of tax (54,662)           (54,662)
Balance at end of year at Jun. 30, 2022 1,014,812 59,885 634,612 125,365 455,590 (211,138) (49,502)
Balance at beginning of year at Mar. 31, 2022   59,885 633,796 121,389 426,320 (180,717) (20,638)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense     1,031        
Lapsed restricted stock units     (215)     211  
Transfer from retained earnings       3,976      
Net income 40,432       40,432    
Cash dividends declared on common stock [1]         (7,186)    
Stocks repurchased           (30,632)  
Transfer to legal surplus         (3,976)    
Other comprehensive (loss) income, net of tax (28,864)           (28,864)
Balance at end of year at Jun. 30, 2022 1,014,812 59,885 634,612 125,365 455,590 (211,138) (49,502)
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     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)    
Stocks repurchased (16,467)         (16,467)  
Transfer to legal surplus 8,700       (8,666)    
Other comprehensive (loss) income, net of tax 3,845           3,845
Balance at end of year at Jun. 30, 2023 1,099,751 59,885 636,051 142,567 577,042 (226,230) (89,564)
Balance at beginning of year 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)    
Stocks repurchased           (13,573)  
Transfer to legal surplus         (4,234)    
Other comprehensive (loss) income, net of tax (11,224)           (11,224)
Balance at end of year at Jun. 30, 2023 $ 1,099,751 $ 59,885 $ 636,051 $ 142,567 $ 577,042 $ (226,230) $ (89,564)
[1] Dividends declared per common share during the quarter ended June 30, 2023 - $0.22 (June 30, 2022 - $0.15). Dividends declared per common share during the six month period ended June 30, 2023 - $0.44 (June 30, 2022 - $0.30).