Accounting Policies, by Policy (Policies) - Trustmark 401(k) Plan [Member] |
12 Months Ended |
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Dec. 31, 2025 | |
| EBP, Accounting Policy [Line Items] | |
| Basis of Presentation | Basis of Presentation
The Plan's financial statements are prepared using the accrual basis of accounting, in conformity with accounting principles generally accepted in the United States of America ("GAAP").
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| Use of Estimates | Use of Estimates
GAAP requires management to make estimates and assumptions that affect the reported amounts of net assets and changes therein. Actual results could differ from those estimates.
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| Investments | Investments
The Plan’s investments are stated at fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date.
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| Notes Receivable from Participants | Notes Receivable from Participants Notes receivable from participants are measured at their unpaid principal balance plus any accrued, but unpaid interest. Interest income is recorded on the accrual basis. Related fees are recorded as administrative expenses and are expensed when they are incurred. No allowance for credit losses has been recorded as of December 31, 2025 and 2024. If a participant ceases to make loan repayments and the plan administrator deems the participant loan to be in default, the participant loan balance is reduced, and a benefit payment is recorded.
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| Contributions | Contributions
Contributions from Plan participants and the matching contributions from the Employer are recorded in the year in which the employee contributions are withheld from compensation.
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| Payment of Benefits | Payment of Benefits
Benefits are recorded when paid.
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| Net Appreciation in Fair Value of Investments | Net Appreciation in Fair Value of Investments
Net appreciation in fair value of investments, as recorded in the accompanying statements of changes in net assets available for benefits, includes changes in the fair value of investments acquired, sold, or held during the year.
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| Administrative Fees | Administrative Fees
Certain administrative fees are paid by the Plan. All other fees, including professional fees, are paid by the Company. Expenses that relate solely to a participant are assessed against such participant as provided in the Plan agreement.
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