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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Preferred stock
Common stock
Surplus
Treasury stock
Retained earnings
Retained earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive income (loss)
Beginning balance at Dec. 31, 2022 $ 4,796,838 $ (544) $ 412,500 $ 60,797 $ 1,902,474 $ (304) $ 2,849,007 $ (544) $ (427,636)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 334,948           334,948    
Other comprehensive loss, net of tax (46,454)               (46,454)
Cash dividends declared on common stock (48,803)           (48,803)    
Dividends on Series D and E preferred stock (13,982)           (13,982)    
Stock-based compensation 16,403       16,403        
Common stock issued for:                  
Exercise of stock options 2,216     54 2,162        
Restricted stock awards (1,662)     283 (283) (1,662)      
Employee stock purchase plan 1,601     22 1,579        
Director compensation plan 1,351     63 1,288        
Ending balance at Jun. 30, 2023 5,041,912   412,500 61,219 1,923,623 (1,966) 3,120,626   (474,090)
Beginning balance at Mar. 31, 2023 5,015,506   412,500 61,198 1,913,947 (1,966) 2,997,263   (367,436)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 154,750           154,750    
Other comprehensive loss, net of tax (106,654)               (106,654)
Cash dividends declared on common stock (24,396)           (24,396)    
Dividends on Series D and E preferred stock (6,991)           (6,991)    
Stock-based compensation 8,108       8,108        
Common stock issued for:                  
Restricted stock awards 0     8 (8)        
Employee stock purchase plan 907     13 894        
Director compensation plan 682       682        
Ending balance at Jun. 30, 2023 5,041,912   412,500 61,219 1,923,623 (1,966) 3,120,626   (474,090)
Beginning balance at Dec. 31, 2023 5,399,526   412,500 61,269 1,943,806 (2,217) 3,345,399   (361,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 339,682           339,682    
Other comprehensive loss, net of tax (150,967)               (150,967)
Cash dividends declared on common stock (55,483)           (55,483)    
Dividends on Series D and E preferred stock (13,982)           (13,982)    
Stock-based compensation 18,107       18,107        
Common stock issued for:                  
Exercise of stock options 25     1 24        
Restricted stock awards (3,539)     523 (519) (3,543)      
Employee stock purchase plan 1,643     17 1,626        
Director compensation plan 1,616     15 1,601        
Ending balance at Jun. 30, 2024 5,536,628   412,500 61,825 1,964,645 (5,760) 3,615,616   (512,198)
Beginning balance at Mar. 31, 2024 5,436,400   412,500 61,798 1,954,532 (5,757) 3,498,475   (485,148)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 152,388           152,388    
Other comprehensive loss, net of tax (27,050)               (27,050)
Cash dividends declared on common stock (28,256)           (28,256)    
Dividends on Series D and E preferred stock (6,991)           (6,991)    
Stock-based compensation 8,950       8,950        
Common stock issued for:                  
Restricted stock awards (35)     18 (50) (3)      
Employee stock purchase plan 902     9 893        
Director compensation plan 320       320        
Ending balance at Jun. 30, 2024 $ 5,536,628   $ 412,500 $ 61,825 $ 1,964,645 $ (5,760) $ 3,615,616   $ (512,198)