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Stock and Incentive Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Compensation Expense for Awards and Units Under Stock Plan | The following table presents information regarding compensation expense for units under the Stock Plan for the periods presented ($ in thousands):
|  |  |  |  |  |  |  |  |  |  | At December 31, 2025 |
|  | Recognized Compensation Expense |  |  | Unrecognized |  |  | Weighted Average |
|  | for Years Ended December 31, |  |  | Compensation |  |  | Life of Unrecognized |
|  | 2025 |  |  | 2024 |  |  | 2023 |  |  | Expense |  |  | Compensation Expense |
Performance awards |  | $ | 2,053 |  |  | $ | 2,827 |  |  | $ | 1,772 |  |  | $ | 2,208 |  |  |  | 1.69 |
Time-based awards |  |  | 4,160 |  |  |  | 4,388 |  |  |  | 4,383 |  |  |  | 2,967 |  |  |  | 1.69 |
Total |  | $ | 6,213 |  |  | $ | 7,215 |  |  | $ | 6,155 |  |  | $ | 5,175 |  |  |  |
Performance Based Award [Member] |
Summary of Stock Plan Activity | The following table summarizes Trustmark’s performance unit activity for the periods presented:
|  | Years Ended December 31, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  |  |  |  | Weighted- |  |  |  |  |  | Weighted- |  |  |  |  |  | Weighted- |
|  |  |  |  | Average |  |  |  |  |  | Average |  |  |  |  |  | Average |
|  |  |  |  | Grant-Date |  |  |  |  |  | Grant-Date |  |  |  |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Nonvested shares, beginning of year |  |  | 208,045 |  |  | $ | 29.39 |  |  |  | 174,214 |  |  | $ | 30.81 |  |  |  | 148,416 |  |  | $ | 31.63 |
Granted |  |  | 63,392 |  |  |  | 37.61 |  |  |  | 80,580 |  |  |  | 26.67 |  |  |  | 70,666 |  |  |  | 29.78 |
Adjustment for performance factor |  |  | 47,415 |  |  |  | 32.64 |  |  |  | 9,348 |  |  |  | 30.02 |  |  |  | — |  |  |  | — |
Released from restriction |  |  | (105,951 | ) |  |  | 32.64 |  |  |  | (54,973 | ) |  |  | 30.02 |  |  |  | (39,943 | ) |  |  | 31.98 |
Forfeited |  |  | (7,674 | ) |  |  | 30.50 |  |  |  | (1,124 | ) |  |  | 28.32 |  |  |  | (4,925 | ) |  |  | 31.41 |
Nonvested shares, end of year |  |  | 205,227 |  |  | $ | 30.96 |  |  |  | 208,045 |  |  | $ | 29.39 |  |  |  | 174,214 |  |  | $ | 30.81 |
Time Based Award [Member] |
Summary of Stock Plan Activity | The following table summarizes Trustmark’s time-based unit activity for the periods presented:
|  | Years Ended December 31, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  |  |  |  | Weighted- |  |  |  |  |  | Weighted- |  |  |  |  |  | Weighted- |
|  |  |  |  | Average |  |  |  |  |  | Average |  |  |  |  |  | Average |
|  |  |  |  | Grant-Date |  |  |  |  |  | Grant-Date |  |  |  |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Nonvested shares, beginning of year |  |  | 372,276 |  |  | $ | 29.37 |  |  |  | 358,252 |  |  | $ | 30.04 |  |  |  | 312,978 |  |  | $ | 30.99 |
Granted |  |  | 131,224 |  |  |  | 36.99 |  |  |  | 167,646 |  |  |  | 27.27 |  |  |  | 145,003 |  |  |  | 28.59 |
Released from restriction |  |  | (123,655 | ) |  |  | 31.50 |  |  |  | (140,637 | ) |  |  | 28.63 |  |  |  | (90,587 | ) |  |  | 30.90 |
Forfeited |  |  | (17,592 | ) |  |  | 30.76 |  |  |  | (12,985 | ) |  |  | 28.79 |  |  |  | (9,142 | ) |  |  | 30.72 |
Nonvested shares, end of year |  |  | 362,253 |  |  | $ | 31.34 |  |  |  | 372,276 |  |  | $ | 29.37 |  |  |  | 358,252 |  |  | $ | 30.04 |

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