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Document and Entity Information
Nov. 12, 2025
Cover [Abstract]  
Entity Registrant Name TRUSTMARK CORP
Amendment Flag false
Entity Central Index Key 0000036146
Document Type 8-K
Document Period End Date Nov. 12, 2025
Entity Incorporation State Country Code MS
Entity File Number 000-03683
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, no par value
Trading Symbol TRMK
Security Exchange Name NASDAQ
Entity Emerging Growth Company false