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Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($)
$ in Thousands
Common Stock
Surplus
Retained Earnings
Cumulative Effect of Adoption of ASU
Retained Earnings
Accumulated Other Comprehensive Loss
Cumulative Effect of Adoption of ASU
Total
Balance (ASU 2023-02) at Dec. 31, 2023     $ (10,246)     $ (10,246)  
Balance at Dec. 31, 2023 $ 190,055 $ 4,240,413   $ 1,685,166 $ (582,536)   $ 5,533,098
Balance (in shares) at Dec. 31, 2023 76,022,039            
Increase (Decrease) in Stockholders' Equity              
Net income       390,605     390,605
Other comprehensive income (loss), net of tax effects         102,896   102,896
Comprehensive income             493,501
Cash dividends declared on common stock per share       (120,391)     (120,391)
Cash dividend equivalents paid on restricted stock units       (1,260)     (1,260)
Employee stock purchases $ 49 1,435         1,484
Employee stock purchases (in shares) 19,484            
Stock options exercised $ 126 3,867         3,993
Stock options exercised (in shares) 50,155            
Restricted stock awards (forfeits) $ (2) 2          
Restricted stock awards (forfeits) (in shares) (316)            
Stock issued pursuant to restricted stock units $ 950 (950)          
Stock issued pursuant to restricted stock units (in shares) 380,151            
Stock issued in lieu of cash - directors fees $ 6 180         186
Stock issued in lieu of cash - directors fees (in shares) 2,211            
Common stock repurchased - buyback plan $ (250) (7,735)         (7,985)
Common stock repurchased - buyback plan (in shares) (100,000)            
Common stock repurchased - equity plans $ (260) (8,438)         (8,698)
Common stock repurchased - equity plans (in shares) (104,147)            
Share-based compensation expense   20,898         20,898
Balance at Sep. 30, 2024 $ 190,674 4,249,672   1,943,874 (479,640)   5,904,580
Balance (in shares) at Sep. 30, 2024 76,269,577            
Balance at Jun. 30, 2024 $ 190,489 4,238,192   1,841,933 (620,211)   5,650,403
Balance (in shares) at Jun. 30, 2024 76,195,723            
Increase (Decrease) in Stockholders' Equity              
Net income       143,179     143,179
Other comprehensive income (loss), net of tax effects         140,571   140,571
Comprehensive income             283,750
Cash dividends declared on common stock per share       (41,174)     (41,174)
Cash dividend equivalents paid on restricted stock units       (64)     (64)
Employee stock purchases $ 26 728         754
Employee stock purchases (in shares) 10,392            
Stock options exercised $ 107 3,445         3,552
Stock options exercised (in shares) 42,707            
Stock issued pursuant to restricted stock units $ 66 (66)          
Stock issued pursuant to restricted stock units (in shares) 26,476            
Stock issued in lieu of cash - directors fees $ 3 90         93
Stock issued in lieu of cash - directors fees (in shares) 1,063            
Common stock repurchased - equity plans $ (17) (588)         (605)
Common stock repurchased - equity plans (in shares) (6,784)            
Share-based compensation expense   7,871         7,871
Balance at Sep. 30, 2024 $ 190,674 4,249,672   1,943,874 (479,640)   5,904,580
Balance (in shares) at Sep. 30, 2024 76,269,577            
Balance at Dec. 31, 2024 $ 190,805 4,259,722   2,046,809 (606,921)   $ 5,890,415
Balance (in shares) at Dec. 31, 2024 76,322,206           76,322,206
Increase (Decrease) in Stockholders' Equity              
Net income       550,945     $ 550,945
Other comprehensive income (loss), net of tax effects         290,909   290,909
Comprehensive income             841,854
Cash dividends declared on common stock per share       (170,191)     (170,191)
Cash dividend equivalents paid on restricted stock units       (1,100)     (1,100)
Employee stock purchases $ 64 2,180         2,244
Employee stock purchases (in shares) 25,550            
Stock options exercised $ 25 447         472
Stock options exercised (in shares) 9,949            
Stock issued pursuant to restricted stock units $ 1,056 (1,056)          
Stock issued pursuant to restricted stock units (in shares) 422,167            
Stock issued in lieu of cash - directors fees $ 9 335         344
Stock issued in lieu of cash - directors fees (in shares) 3,653            
Common stock repurchased - buyback plan $ (1,100) (41,708)         (42,808)
Common stock repurchased - buyback plan (in shares) (440,000)            
Common stock repurchased - equity plans $ (283) (11,212)         (11,495)
Common stock repurchased - equity plans (in shares) (113,025)            
Share-based compensation expense   28,444         28,444
Common stock issued for Independent acquisition $ 62,147 2,410,800         2,472,947
Common stock issued for Independent acquisition (in shares) 24,858,731            
Balance at Sep. 30, 2025 $ 252,723 6,647,952   2,426,463 (316,012)   $ 9,011,126
Balance (in shares) at Sep. 30, 2025 101,089,231           101,089,231
Balance at Jun. 30, 2025 $ 253,745 6,679,028   2,240,470 (372,109)   $ 8,801,134
Balance (in shares) at Jun. 30, 2025 101,498,000            
Increase (Decrease) in Stockholders' Equity              
Net income       246,641     246,641
Other comprehensive income (loss), net of tax effects         56,097   56,097
Comprehensive income             302,738
Cash dividends declared on common stock per share       (60,648)     (60,648)
Employee stock purchases $ 33 1,099         1,132
Employee stock purchases (in shares) 12,935            
Stock options exercised $ 7 132         139
Stock options exercised (in shares) 2,902            
Stock issued pursuant to restricted stock units $ 41 (41)          
Stock issued pursuant to restricted stock units (in shares) 16,276            
Stock issued in lieu of cash - directors fees $ 3 123         126
Stock issued in lieu of cash - directors fees (in shares) 1,346            
Common stock repurchased - buyback plan $ (1,100) (41,708)         (42,808)
Common stock repurchased - buyback plan (in shares) (440,000)            
Common stock repurchased - equity plans $ (6) (216)         (222)
Common stock repurchased - equity plans (in shares) (2,228)            
Share-based compensation expense   9,535         9,535
Balance at Sep. 30, 2025 $ 252,723 $ 6,647,952   $ 2,426,463 $ (316,012)   $ 9,011,126
Balance (in shares) at Sep. 30, 2025 101,089,231           101,089,231