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Defined Benefit and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2025
Trustmark Capital Accumulation Plan [Member] |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net Periodic Benefit Cost | 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 |
Supplemental Retirement Plan [Member] |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net Periodic Benefit Cost | 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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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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