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Defined Benefit and Other Postretirement Benefits - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 USD ($)
Trustmark Capital Accumulation Plan [Member] | Forecast |
Defined Benefit Plan Disclosure [Line Items] |
Trustmark's minimum required contribution to the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions | $ 109

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