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Defined Benefit and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Defined Benefit and Other Postretirement Benefits | Note 11 – Defined Benefit and Other Postretirement Benefits Qualified Pension Plan Trustmark maintains a noncontributory tax-qualified defined benefit pension plan titled the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions (the Continuing Plan) to satisfy commitments made by Trustmark to associates covered through plans obtained in acquisitions. The following table presents information regarding the net periodic benefit cost for the Continuing Plan for the periods presented ($ in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Service cost |  | $ | 9 |  |  | $ | 10 |  |  | $ | 18 |  |  | $ | 20 |
Interest cost |  |  | 69 |  |  |  | 61 |  |  |  | 138 |  |  |  | 123 |
Expected return on plan assets |  |  | (31 | ) |  |  | (24 | ) |  |  | (63 | ) |  |  | (48 | )
Recognized net (gain) loss due to lump sum settlements |  |  | — |  |  |  | (13 | ) |  |  | (50 | ) |  |  | (13 | )
Recognized net actuarial (gain) loss |  |  | (2 | ) |  |  | — |  |  |  | (4 | ) |  |  | — |
Net periodic benefit cost |  | $ | 45 |  |  | $ | 34 |  |  | $ | 39 |  |  | $ | 82 |
For the plan year ending December 31, 2025, Trustmark’s minimum required contribution to the Continuing Plan is $109 thousand; however, Management and the Board of Directors of Trustmark will monitor the Continuing Plan throughout 2025 to determine any additional funding requirements by the plan’s measurement date, which is December 31. Supplemental Retirement Plans Trustmark maintains a nonqualified supplemental retirement plan covering key executive officers and senior officers as well as directors who have elected to defer fees. The plan provides for retirement and/or death benefits based on a participant’s covered salary or deferred fees. Although plan benefits may be paid from Trustmark’s general assets, Trustmark has purchased life insurance contracts on the participants covered under the plan, which may be used to fund future benefit payments under the plan. The annual measurement date for the plan is December 31. As a result of mergers prior to 2014, Trustmark became the administrator of nonqualified supplemental retirement plans, for which the plan benefits were frozen prior to the merger date. The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Service cost |  | $ | 4 |  |  | $ | 11 |  |  | $ | 8 |  |  | $ | 22 |
Interest cost |  |  | 475 |  |  |  | 459 |  |  |  | 970 |  |  |  | 936 |
Amortization of prior service cost |  |  | 3 |  |  |  | 27 |  |  |  | 7 |  |  |  | 55 |
Recognized net actuarial loss |  |  | 63 |  |  |  | 84 |  |  |  | 136 |  |  |  | 179 |
Net periodic benefit cost |  | $ | 545 |  |  | $ | 581 |  |  | $ | 1,121 |  |  | $ | 1,192 |

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