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UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Preferred stock
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, 2020   $ 92,000   $ 622,652 $ 103,269 $ 300,096 $ (102,949) $ 11,022
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Redemption of preferred stock   (92,000)            
Stock-based compensation expense       4,993        
Lapsed restricted stock units       (1,967)     2,248  
Redemption of preferred stock, issuance costs       10,130   (10,130)    
Transfer from retained earnings         11,216      
Net income $ 112,871         112,871    
Cash dividends declared on common stock [1]           (14,637)    
Cash dividends declared on preferred stock           (1,255)    
Transfer to legal surplus           (11,216)    
Stock repurchased (40,161)           (40,161)  
Other comprehensive (loss) income, net of tax (2,402)             (2,402)
Balance at end of period at Sep. 30, 2021 1,053,665 0 $ 59,885 635,808 114,485 375,729 (140,862) 8,620
Balance at beginning of period at Jun. 30, 2021   24,000   626,995 110,235 352,001 (100,719) 7,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Redemption of preferred stock   (24,000)            
Stock-based compensation expense       1,378        
Lapsed restricted stock units       (18)     18  
Redemption of preferred stock, issuance costs       7,453   (7,453)    
Transfer from retained earnings         4,250      
Net income 41,671         41,671    
Cash dividends declared on common stock [1]           (6,240)    
Transfer to legal surplus           (4,250)    
Stock repurchased             (40,161)  
Other comprehensive (loss) income, net of tax 1,020             1,020
Balance at end of period at Sep. 30, 2021 1,053,665 $ 0 59,885 635,808 114,485 375,729 (140,862) 8,620
Balance at beginning of period at Dec. 31, 2021 1,069,160     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)    
Transfer to legal surplus           (11,752)    
Stock repurchased (64,110)           (64,110)  
Other comprehensive (loss) income, net of tax (109,049)             (109,049)
Balance at end of period at Sep. 30, 2022 993,867   59,885 635,523 129,429 484,057 (211,138) (103,889)
Balance at beginning of period at Jun. 30, 2022       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)    
Transfer to legal surplus           (4,064)    
Stock repurchased             0  
Other comprehensive (loss) income, net of tax (54,387)             (54,387)
Balance at end of period at Sep. 30, 2022 $ 993,867   $ 59,885 $ 635,523 $ 129,429 $ 484,057 $ (211,138) $ (103,889)
[1] Dividends declared per common share during the quarter ended September 30, 2022 - $0.20 (September 30, 2021 - $0.12). Dividends declared per common share during the nine-month period ended September 30, 2022 - $0.50 (September 30, 2021 - $0.28).