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Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Capital Surplus
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2023 $ 5,562,900 $ 230,500 $ 292,655 $ 4,159,924 $ 1,618,630 $ (738,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 120,284       120,284  
Other comprehensive income (loss) (40,819)         (40,819)
Cash dividends:            
Common (41,060)       (41,060)  
Preferred (4,034)       (4,034)  
Common stock issued for Employee Stock Purchase Plan (“ESPP”) 265   17 248    
Common stock repurchased (7,182)   (434) (6,748)    
Share-based compensation expense 5,491     5,491    
Stock activity under incentive compensation plans (437)   1,092 (1,373) (156)  
Ending balance at Mar. 31, 2024 5,595,408 230,500 293,330 4,157,542 1,693,664 (779,628)
Beginning balance at Dec. 31, 2023 5,562,900 230,500 292,655 4,159,924 1,618,630 (738,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 385,315          
Other comprehensive income (loss) 135,053          
Acquisition 417,598          
Ending balance at Sep. 30, 2024 6,367,298 230,500 318,955 4,560,576 1,861,023 (603,756)
Beginning balance at Mar. 31, 2024 5,595,408 230,500 293,330 4,157,542 1,693,664 (779,628)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 121,229       121,229  
Other comprehensive income (loss) (11,780)         (11,780)
Acquisition 417,598   24,014 393,584    
Cash dividends:            
Common (44,656)       (44,656)  
Preferred (4,033)       (4,033)  
Common stock issued for Employee Stock Purchase Plan (“ESPP”) 265   16 249    
Common stock repurchased (1,276)   (77) (1,199)    
Share-based compensation expense 9,062     9,062    
Stock activity under incentive compensation plans (6,745)   1,686 (8,273) (158)  
Ending balance at Jun. 30, 2024 6,075,072 230,500 318,969 4,550,965 1,766,046 (791,408)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 143,802       143,802  
Other comprehensive income (loss) 187,652         187,652
Cash dividends:            
Common (44,654)       (44,654)  
Preferred (4,034)       (4,034)  
Common stock issued for Employee Stock Purchase Plan (“ESPP”) 254   15 239    
Common stock repurchased (287)   (15) (272)    
Share-based compensation expense 8,703     8,703    
Stock activity under incentive compensation plans 790   (14) 941 (137)  
Ending balance at Sep. 30, 2024 6,367,298 230,500 318,955 4,560,576 1,861,023 (603,756)
Beginning balance at Dec. 31, 2024 6,340,350 230,500 318,980 4,570,865 1,966,048 (746,043)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 144,659       144,659  
Other comprehensive income (loss) 97,534         97,534
Cash dividends:            
Common (44,653)       (44,653)  
Preferred (4,034)       (4,034)  
Common stock issued for Employee Stock Purchase Plan (“ESPP”) 250   12 238    
Common stock repurchased (13,538)   (611) (12,927)    
Share-based compensation expense 14,411     14,411    
Stock activity under incentive compensation plans (325)   855 (481) (699)  
Ending balance at Mar. 31, 2025 6,534,654 230,500 319,236 4,572,106 2,061,321 (648,509)
Beginning balance at Dec. 31, 2024 6,340,350 230,500 318,980 4,570,865 1,966,048 (746,043)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 452,634          
Other comprehensive income (loss) 221,652          
Acquisition 1,033,262          
Ending balance at Sep. 30, 2025 8,309,271 230,500 390,768 5,961,394 2,251,000 (524,391)
Beginning balance at Mar. 31, 2025 6,534,654 230,500 319,236 4,572,106 2,061,321 (648,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 125,408       125,408  
Other comprehensive income (loss) 48,901         48,901
Acquisition 1,033,262   50,183 983,079    
Cash dividends:            
Common (54,855)       (54,855)  
Preferred (4,033)       (4,033)  
Common stock issued for Employee Stock Purchase Plan (“ESPP”) 256   13 243    
Forward sale agreements 443,236   21,905 421,331    
Common stock repurchased (7,957)   (379) (7,578)    
Share-based compensation expense 7,739     7,739    
Stock activity under incentive compensation plans (224)   860 (736) (348)  
Ending balance at Jun. 30, 2025 8,126,387 230,500 391,818 5,976,184 2,127,493 (599,608)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 182,567       182,567  
Other comprehensive income (loss) 75,217         75,217
Cash dividends:            
Common (54,863)       (54,863)  
Preferred (4,034)       (4,034)  
Common stock issued for Employee Stock Purchase Plan (“ESPP”) 265   13 252    
Common stock repurchased (25,203)   (1,122) (24,081)    
Share-based compensation expense 8,610     8,610    
Stock activity under incentive compensation plans 325   59 429 (163)  
Ending balance at Sep. 30, 2025 $ 8,309,271 $ 230,500 $ 390,768 $ 5,961,394 $ 2,251,000 $ (524,391)