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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Jan. 30, 2026
Jun. 30, 2025
Cover [Abstract]      
Entity Registrant Name TRUSTMARK CORP    
Entity Central Index Key 0000036146    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Trading Symbol TRMK    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Title of 12(b) Security Common Stock, no par value    
Security Exchange Name NASDAQ    
Entity File Number 000-3683    
Entity Incorporation, State or Country Code MS    
Entity Tax Identification Number 64-0471500    
Entity Address, Address Line One 248 East Capitol Street    
Entity Address, City or Town Jackson    
Entity Address, State or Province MS    
Entity Address, Postal Zip Code 39201    
City Area Code 601    
Local Phone Number 208-5111    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 961.6
Entity Common Stock, Shares Outstanding   58,849,788  
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement for Trustmark’s 2026 Annual Meeting of Shareholders to be held April 28, 2026 are incorporated by reference into Part III of the Form 10-K report.

    
Auditor Name Crowe LLP    
Auditor Location Fort Lauderdale, Florida    
Auditor Firm ID 173    
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Trustmark Corporation and subsidiaries (the "Company") as of December 31, 2025 and 2024, the related consolidated statements of income, comprehensive income, changes in shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2025, and the related notes (collectively referred to as the "financial statements"). We also have audited the Company’s internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control – Integrated Framework: (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2025 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control – Integrated Framework: (2013) issued by COSO.