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Defined Benefit and Other Postretirement Benefits - Estimated Future Benefit Payments and Other Disclosures (Details) $ in Thousands | Dec. 31, 2025 USD ($)
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Estimated future benefit payments [Abstract] |
2030 | $ 3,465
Supplemental Retirement Plan [Member] |
Estimated future benefit payments [Abstract] |
2026 | 3,856
2027 | 3,687
2028 | 3,562
2029 | 3,563
2031 - 2035 | 14,656
Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member] | Trustmark Capital Accumulation Plan [Member] |
Estimated future benefit payments [Abstract] |
2026 | 624
2027 | 846
2028 | 513
2029 | 374
2030 | 334
2031 - 2035 | $ 1,178

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