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Borrowings - Junior Subordinated Debt Securities - Additional information (Details)
$ in Thousands
 12 Months Ended
Aug. 18, 2006
USD ($)
qtr
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Variable Interest Entity [Line Items]        
Junior subordinated debt securities   $ 61,856 $ 61,856  
Total assets   18,925,211 18,152,422  
Total liabilities and shareholders' equity   18,925,211 18,152,422  
Common securities   12,296 12,711  
Net income   224,135 223,009 $ 165,489
Trustmark Preferred Capital Trust I [Member] | Junior Subordinated Debt Securities [Member]        
Variable Interest Entity [Line Items]        
Face amount of debt issued $ 60,000      
Maturity date Sep. 30, 2036      
Variable interest rate, description three-month Chicago Mercantile Exchange, Inc. (CME) SOFR      
Basis spread over SOFR rate (in hundredths) 0.26%      
Debt instrument interest rate margin 1.72%      
Junior subordinated debt securities $ 61,900      
Consecutive quarters that Trustmark may defer interest payments | qtr 20      
Total assets   61,900 61,900  
Total liabilities and shareholders' equity   61,900 61,900  
Trust preferred securities   60,000 60,000  
Common securities   1,900 1,900  
Net income   117 134 132
Dividends paid   $ 117 $ 134 $ 132