Segment Information - Additional Information (Details) |
6 Months Ended |
|---|---|
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Jun. 30, 2025
Segment
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| Segment Reporting [Abstract] | |
| Number of segments in which the business operates | 2 |
| Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] | srt:ChiefExecutiveOfficerMember |
| Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description | The CEO evaluates the financial performance of Trustmark's lines of business, such as evaluating revenue streams, significant expenses and budget to actual results, in assessing the performance of Trustmark's reportable segments and in the determination of allocating resources. |