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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - 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 loss
Balance at beginning of period 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 622,626           622,626    
Other comprehensive (loss) income , net of tax 66,405               66,405
Cash dividends declared on common stock (97,726)           (97,726)    
Dividends on Series D and E preferred stock (27,964)           (27,964)    
Stock-based compensation 33,495       33,495        
Common stock issued for:                  
Acquisition of Macatawa Bank Corporation 0                
Exercise of stock options 2,242     56 2,186        
Restricted stock awards (1,913)     307 (307) (1,913)      
Employee stock purchase plan 3,329     46 3,283        
Director compensation plan 2,738     63 2,675        
Balance at end of period 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 695,045           695,045    
Other comprehensive (loss) income , net of tax (147,104)               (147,104)
Cash dividends declared on common stock (115,316)           (115,316)    
Dividends on Series D and E preferred stock (27,964)           (27,964)    
Stock-based compensation 38,108       38,108        
Common stock issued for:                  
Acquisition of Macatawa Bank Corporation 499,239     4,702 494,537        
Exercise of stock options 86     2 84        
Restricted stock awards (3,931)     537 (532) (3,936)      
Employee stock purchase plan 3,347     35 3,312        
Director compensation plan 3,261     15 3,246        
Balance at end of period at Dec. 31, 2024 6,344,297   412,500 66,560 2,482,561 (6,153) 3,897,164   (508,335)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 823,844           823,844    
Other comprehensive (loss) income , net of tax 212,581               212,581
Cash dividends declared on common stock (133,779)           (133,779)    
Dividends on Series D and E preferred stock (35,644)           (35,644)    
Redemption of Series D and Series E preferred stock (412,500)   (412,500)   14,046   (14,046)    
Issuance of Series F preferred stock 414,148   425,000   (10,852)        
Stock-based compensation 41,551       41,551        
Common stock issued for:                  
Acquisition of Macatawa Bank Corporation 0                
Exercise of stock options 220     5 215        
Restricted stock awards (3,003)     448 (448) (3,003)      
Employee stock purchase plan 3,519     30 3,489        
Director compensation plan 3,481     19 3,462        
Balance at end of period at Dec. 31, 2025 $ 7,258,715   $ 425,000 $ 67,062 $ 2,534,024 $ (9,156) $ 4,537,539   $ (295,754)