Fair Value Measurements - Fair Value of Investments that Calculate NAV Per Share (Details) - Trustmark 401(k) Plan [Member] - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Collective Investment Funds [Member]
Fair Value Measurements [Abstract]
Investments	$ 192,747,015	$ 174,713,346
Unfunded Commitments	$ 0	$ 0
Redemption Frequency	Daily	Daily
Redemption Notice Period	1 day	1 day
Pooled Separate Account [Member]
Fair Value Measurements [Abstract]
Investments	$ 40,594,374	$ 38,239,215
Unfunded Commitments	$ 0	$ 0
Redemption Frequency	Daily	Daily
Redemption Notice Period	1 day	1 day

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details