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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Deferred Compensation [Member]
Accumulated Other Comprehensive Earnings (Loss) [Member]
Beginning Balance at Dec. 31, 2023 $ 1,498,900 $ 1,427 $ 681,246 $ 1,219,525 $ (11,855) $ 11,855 $ (403,298)
Beginning Balance, Shares at Dec. 31, 2023   142,716,939          
Treasury Stock, Beginning Balance, Shares at Dec. 31, 2023         (930,152)    
Net Income (Loss) 161,190     161,190      
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited) 2,387 $ 2 2,385        
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares   189,131          
Cash dividends declared (77,201)     (77,201)      
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited) 73,481           73,481
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)         $ (798) 798  
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares         (1,271)    
Stock- based compensation expense (unaudited) 3,434   3,434        
Ending Balance at Sep. 30, 2024 $ 1,662,191 $ 1,429 687,065 1,303,514 $ (12,653) 12,653 (329,817)
Ending Balance, Shares at Sep. 30, 2024   142,906,070          
Treasury Stock, Ending Balance, Shares at Sep. 30, 2024 (931,423)       (931,423)    
Beginning Balance at Jun. 30, 2024 $ 1,519,026 $ 1,428 685,209 1,273,946 $ (12,378) 12,378 (441,557)
Beginning Balance, Shares at Jun. 30, 2024   142,848,909          
Treasury Stock, Beginning Balance, Shares at Jun. 30, 2024         (934,135)    
Net Income (Loss) 55,308     55,308      
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited) 602 $ 1 601        
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares   57,161          
Cash dividends declared (25,740)     (25,740)      
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited) 111,740           111,740
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)         $ (275) 275  
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares         (2,712)    
Stock- based compensation expense (unaudited) 1,255   1,255        
Ending Balance at Sep. 30, 2024 $ 1,662,191 $ 1,429 687,065 1,303,514 $ (12,653) 12,653 (329,817)
Ending Balance, Shares at Sep. 30, 2024   142,906,070          
Treasury Stock, Ending Balance, Shares at Sep. 30, 2024 (931,423)       (931,423)    
Beginning Balance at Dec. 31, 2024 $ 1,606,560 $ 1,429 689,338 1,340,082 $ (12,905) 12,905 (424,289)
Beginning Balance, Shares at Dec. 31, 2024   142,944,704          
Treasury Stock, Beginning Balance, Shares at Dec. 31, 2024 (929,735)       (929,735)    
Net Income (Loss) $ 180,270     180,270      
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited) 2,915 $ 3 2,912        
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares   243,347          
Cash dividends declared (80,245)     (80,245)      
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited) 115,710           115,710
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)         $ (1,079) 1,079  
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares         (1,161)    
Stock- based compensation expense (unaudited) 5,058   5,058        
Ending Balance at Sep. 30, 2025 $ 1,830,268 $ 1,432 697,308 1,440,107 $ (13,984) 13,984 (308,579)
Ending Balance, Shares at Sep. 30, 2025   143,188,051          
Treasury Stock, Ending Balance, Shares at Sep. 30, 2025 (930,896)       (930,896)    
Beginning Balance at Jun. 30, 2025 $ 1,737,352 $ 1,431 694,273 1,415,104 $ (13,594) 13,594 (373,456)
Beginning Balance, Shares at Jun. 30, 2025   143,077,619          
Treasury Stock, Beginning Balance, Shares at Jun. 30, 2025         (929,782)    
Net Income (Loss) 52,267     52,267      
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited) (1,436) $ 1 1,435        
Stock option exercises/ stock unit conversions/ restricted stock activity (unaudited), Shares   110,432          
Cash dividends declared (27,264)     (27,264)      
Change in unrealized gain (loss) in investment securities available-for-sale, net of related income taxes (unaudited) 64,877           64,877
Shares purchased in connection with directors' deferred compensation plan, net (unaudited)         $ (390) 390  
Shares purchased in connection with directors' deferred compensation plan, net (unaudited), Shares         (1,114)    
Stock- based compensation expense (unaudited) 1,600   1,600        
Ending Balance at Sep. 30, 2025 $ 1,830,268 $ 1,432 $ 697,308 $ 1,440,107 $ (13,984) $ 13,984 $ (308,579)
Ending Balance, Shares at Sep. 30, 2025   143,188,051          
Treasury Stock, Ending Balance, Shares at Sep. 30, 2025 (930,896)       (930,896)