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Parent Company Only Financial Information - Parent Only Financial Statements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets        
Other assets [1] $ 646,308 $ 677,356    
Total Assets 18,925,211 18,152,422    
Liabilities and Shareholders' Equity:        
Subordinated notes 171,966 123,702    
Junior subordinated debt securities 61,856 61,856    
Shareholders' equity 2,121,677 1,962,327 $ 1,661,847 $ 1,492,268
Total Liabilities and Shareholders' Equity 18,925,211 18,152,422    
Expense:        
Net Income 224,135 223,009 165,489  
Operating Activities        
Net income 224,135 223,009 165,489  
Adjustments to reconcile net income to net cash provided by operating activities:        
Other 9,849 (32,549) 1,192  
Net cash from operating activities 243,902 116,929 196,887  
Financing Activities        
Net proceeds from subordinated notes 171,936 0 0  
Payment of subordinated notes (125,000) 0 0  
Common stock dividends (58,456) (56,790) (56,653)  
Repurchase and retirement of common stock (80,036) (7,499) 0  
Net cash from financing activities 443,053 (809,615) 455,043  
Net change in cash and cash equivalents 100,756 (408,092) 240,756  
Trustmark Corp (Parent Company Only) [Member]        
Assets        
Investment in banks 2,217,339 2,062,555    
Other assets 141,547 86,907    
Total Assets 2,358,886 2,149,462    
Liabilities and Shareholders' Equity:        
Accrued expense 3,387 1,577    
Subordinated notes 171,966 123,702    
Junior subordinated debt securities 61,856 61,856    
Shareholders' equity 2,121,677 1,962,327    
Total Liabilities and Shareholders' Equity 2,358,886 2,149,462    
Revenue:        
Dividends received from banks 155,440 82,536 67,189  
Earnings of subsidiaries over distributions 78,537 148,884 106,388  
Other income 156 165 163  
Total Revenue 234,133 231,585 173,740  
Expense:        
Other expense 9,998 8,576 8,251  
Total Expense 9,998 8,576 8,251  
Net Income 224,135 223,009 165,489  
Operating Activities        
Net income 224,135 223,009 165,489  
Adjustments to reconcile net income to net cash provided by operating activities:        
Net change in investment in subsidiaries (78,537) (148,884) (106,388)  
Other 605 (835) (797)  
Net cash from operating activities 146,203 73,290 58,304  
Financing Activities        
Net proceeds from subordinated notes 171,936 0 0  
Payment of subordinated notes (125,000) 0 0  
Common stock dividends (58,456) (56,790) (56,653)  
Repurchase and retirement of common stock (80,036) (7,499) 0  
Net cash from financing activities (91,556) (64,289) (56,653)  
Net change in cash and cash equivalents 54,647 9,001 1,651  
Cash and cash equivalents at beginning of year 86,512 77,511 75,860  
Cash and cash equivalents at end of year $ 141,159 $ 86,512 $ 77,511  
[1] Trustmark reclassified its identifiable intangible assets, net to other assets for the prior period.