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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
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    
Entity Public Float     $ 1,228
Entity Common Stock, Shares Outstanding   61,493,625  
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
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 false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement for Trustmark’s 2022 Annual Meeting of Shareholders to be held April 27, 2022 are incorporated by reference into Part III of the Form 10-K report.

    
Auditor Name Crowe LLP    
Auditor Location Atlanta, Georgia    
Auditor Firm ID 173