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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2025
Stockholders' Equity Note [Abstract] |
Table of Actual Regulatory Capital Amounts and Ratios | The following table provides Trustmark’s and TB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at December 31, 2025 and 2024 ($ in thousands):
|  | Actual |  |  |  |  |  |  |
|  | Regulatory Capital |  |  | Minimum |  |  | To Be Well |
|  | Amount |  |  | Ratio |  |  | Requirement |  |  | Capitalized |
At December 31, 2025: |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,814,295 |  |  |  | 11.72 | % |  |  | 7.000 | % |  | n/a |
Trustmark Bank |  |  | 1,908,101 |  |  |  | 12.33 | % |  |  | 7.000 | % |  |  | 6.50 | %
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,874,295 |  |  |  | 12.11 | % |  |  | 8.500 | % |  | n/a |
Trustmark Bank |  |  | 1,908,101 |  |  |  | 12.33 | % |  |  | 8.500 | % |  |  | 8.00 | %
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 2,231,283 |  |  |  | 14.41 | % |  |  | 10.500 | % |  | n/a |
Trustmark Bank |  |  | 2,093,123 |  |  |  | 13.52 | % |  |  | 10.500 | % |  |  | 10.00 | %
Tier 1 Leverage (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,874,295 |  |  |  | 10.18 | % |  |  | 4.00 | % |  | n/a |
Trustmark Bank |  |  | 1,908,101 |  |  |  | 10.37 | % |  |  | 4.00 | % |  |  | 5.00 | %
At December 31, 2024: |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,729,672 |  |  |  | 11.54 | % |  |  | 7.000 | % |  | n/a |
Trustmark Bank |  |  | 1,828,044 |  |  |  | 12.20 | % |  |  | 7.000 | % |  |  | 6.50 | %
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,789,672 |  |  |  | 11.94 | % |  |  | 8.500 | % |  | n/a |
Trustmark Bank |  |  | 1,828,044 |  |  |  | 12.20 | % |  |  | 8.500 | % |  |  | 8.00 | %
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 2,094,874 |  |  |  | 13.97 | % |  |  | 10.500 | % |  | n/a |
Trustmark Bank |  |  | 2,009,544 |  |  |  | 13.41 | % |  |  | 10.500 | % |  |  | 10.00 | %
Tier 1 Leverage (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,789,672 |  |  |  | 9.99 | % |  |  | 4.00 | % |  | n/a |
Trustmark Bank |  |  | 1,828,044 |  |  |  | 10.21 | % |  |  | 4.00 | % |  |  | 5.00 | %
Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects | The following tables present the net change in the components of accumulated other comprehensive income (loss) and the related tax effects allocated to each component for the years ended December 31, 2025, 2024 and 2023 ($ in thousands).
|  | Before Tax |  |  | Tax (Expense) |  |  | Net of Tax |
|  | Amount |  |  | Benefit |  |  | Amount |
Year Ended December 31, 2025 |  |  |  |  |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |
Net unrealized holding gains (losses) arising during the period |  | $ | 61,389 |  |  | $ | (15,346 | ) |  | $ | 46,043 |
Reclassification adjustment for net (gains) losses realized in net income |  |  | — |  |  |  | — |  |  |  | — |
Change in net unrealized holding loss on securities transferred to held to maturity |  |  | 13,765 |  |  |  | (3,441 | ) |  |  | 10,324 |
Total securities available for sale and transferred securities |  |  | 75,154 |  |  |  | (18,787 | ) |  |  | 56,367 |
Pension and other postretirement benefit plans: |  |  |  |  |  |  |  |  |
Change in the actuarial loss of pension and other postretirement benefit plans |  |  | (660 | ) |  |  | 165 |  |  |  | (495 | )
Reclassification adjustments for changes realized in net income: |  |  |  |  |  |  |  |  |
Net change in prior service costs |  |  | 15 |  |  |  | (4 | ) |  |  | 11 |
Recognized net loss due to lump sum settlements |  |  | (79 | ) |  |  | 20 |  |  |  | (59 | )
Change in net actuarial loss |  |  | 127 |  |  |  | (32 | ) |  |  | 95 |
Total pension and other postretirement benefit plans |  |  | (597 | ) |  |  | 149 |  |  |  | (448 | )
Cash flow hedge derivatives: |  |  |  |  |  |  |  |  |
Change in accumulated gain (loss) on effective cash flow hedge derivatives |  |  | 9,299 |  |  |  | (2,325 | ) |  |  | 6,974 |
Reclassification adjustment for (gain) loss realized in net income |  |  | 9,521 |  |  |  | (2,380 | ) |  |  | 7,141 |
Total cash flow hedge derivatives |  |  | 18,820 |  |  |  | (4,705 | ) |  |  | 14,115 |
Total other comprehensive income (loss) |  | $ | 93,377 |  |  | $ | (23,343 | ) |  | $ | 70,034 |
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |
Net unrealized holding gains (losses) arising during the period |  | $ | (13,666 | ) |  | $ | 3,417 |  |  | $ | (10,249 | )
Reclassification adjustment for net (gains) losses realized in net income |  |  | 182,792 |  |  |  | (45,698 | ) |  |  | 137,094 |
Change in net unrealized holding loss on securities transferred to held to maturity |  |  | 14,587 |  |  |  | (3,647 | ) |  |  | 10,940 |
Total securities available for sale and transferred securities |  |  | 183,713 |  |  |  | (45,928 | ) |  |  | 137,785 |
Pension and other postretirement benefit plans: |  |  |  |  |  |  |  |  |
Change in the actuarial loss of pension and other postretirement benefit plans |  |  | 1,460 |  |  |  | (365 | ) |  |  | 1,095 |
Reclassification adjustments for changes realized in net income: |  |  |  |  |  |  |  |  |
Net change in prior service costs |  |  | 111 |  |  |  | (28 | ) |  |  | 83 |
Recognized net loss due to lump sum settlements |  |  | (13 | ) |  |  | 3 |  |  |  | (10 | )
Change in net actuarial loss |  |  | 248 |  |  |  | (62 | ) |  |  | 186 |
Total pension and other postretirement benefit plans |  |  | 1,806 |  |  |  | (452 | ) |  |  | 1,354 |
Cash flow hedge derivatives: |  |  |  |  |  |  |  |  |
Change in accumulated gain (loss) on effective cash flow hedge derivatives |  |  | (22,232 | ) |  |  | 5,558 |  |  |  | (16,674 | )
Reclassification adjustment for (gain) loss realized in net income |  |  | 18,132 |  |  |  | (4,533 | ) |  |  | 13,599 |
Total cash flow hedge derivatives |  |  | (4,100 | ) |  |  | 1,025 |  |  |  | (3,075 | )
Total other comprehensive income (loss) |  | $ | 181,419 |  |  | $ | (45,355 | ) |  | $ | 136,064 |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |
Net unrealized holding gains (losses) arising during the period |  | $ | 50,537 |  |  | $ | (12,404 | ) |  | $ | 38,133 |
Reclassification adjustment for net (gains) losses realized in net income |  |  | (39 | ) |  |  | 10 |  |  |  | (29 | )
Change in net unrealized holding loss on securities transferred to held to maturity |  |  | 15,557 |  |  |  | (3,889 | ) |  |  | 11,668 |
Total securities available for sale and transferred securities |  |  | 66,055 |  |  |  | (16,283 | ) |  |  | 49,772 |
Pension and other postretirement benefit plans: |  |  |  |  |  |  |  |  |
Change in the actuarial loss of pension and other postretirement benefit plans |  |  | (691 | ) |  |  | 173 |  |  |  | (518 | )
Reclassification adjustments for changes realized in net income: |  |  |  |  |  |  |  |  |
Net change in prior service costs |  |  | 111 |  |  |  | (28 | ) |  |  | 83 |
Recognized net loss due to lump sum settlements |  |  | 25 |  |  |  | (6 | ) |  |  | 19 |
Change in net actuarial loss |  |  | 177 |  |  |  | (44 | ) |  |  | 133 |
Total pension and other postretirement benefit plans |  |  | (378 | ) |  |  | 95 |  |  |  | (283 | )
Cash flow hedge derivatives: |  |  |  |  |  |  |  |  |
Change in accumulated gain (loss) on effective cash flow hedge derivatives |  |  | (8,131 | ) |  |  | 2,033 |  |  |  | (6,098 | )
Reclassification adjustment for (gain) loss realized in net income |  |  | 16,385 |  |  |  | (4,096 | ) |  |  | 12,289 |
Total cash flow hedge derivatives |  |  | 8,254 |  |  |  | (2,063 | ) |  |  | 6,191 |
Total other comprehensive income (loss) |  | $ | 73,931 |  |  | $ | (18,251 | ) |  | $ | 55,680 |
Summary of Changes in Balances of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the periods presented ($ in thousands). All amounts are presented net of tax.
|  | Securities Available for Sale and Transferred Securities |  |  | Defined Benefit Pension Items |  |  | Cash Flow Hedge Derivative |  |  | Total |
Balance, January 1, 2023 |  | $ | (254,442 | ) |  | $ | (5,792 | ) |  | $ | (15,169 | ) |  | $ | (275,403 | )
Other comprehensive income (loss) before reclassification |  |  | 49,801 |  |  |  | (518 | ) |  |  | (6,098 | ) |  |  | 43,185 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (29 | ) |  |  | 235 |  |  |  | 12,289 |  |  |  | 12,495 |
Net other comprehensive income (loss) |  |  | 49,772 |  |  |  | (283 | ) |  |  | 6,191 |  |  |  | 55,680 |
Balance, December 31, 2023 |  |  | (204,670 | ) |  |  | (6,075 | ) |  |  | (8,978 | ) |  |  | (219,723 | )
Other comprehensive income (loss) before reclassification |  |  | 691 |  |  |  | 1,095 |  |  |  | (16,674 | ) |  |  | (14,888 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 137,094 |  |  |  | 259 |  |  |  | 13,599 |  |  |  | 150,952 |
Net other comprehensive income (loss) |  |  | 137,785 |  |  |  | 1,354 |  |  |  | (3,075 | ) |  |  | 136,064 |
Balance, December 31, 2024 |  |  | (66,885 | ) |  |  | (4,721 | ) |  |  | (12,053 | ) |  |  | (83,659 | )
Other comprehensive income (loss) before reclassification |  |  | 56,367 |  |  |  | (495 | ) |  |  | 6,974 |  |  |  | 62,846 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | 47 |  |  |  | 7,141 |  |  |  | 7,188 |
Net other comprehensive income (loss) |  |  | 56,367 |  |  |  | (448 | ) |  |  | 14,115 |  |  |  | 70,034 |
Balance, December 31, 2025 |  | $ | (10,518 | ) |  | $ | (5,169 | ) |  | $ | 2,062 |  |  | $ | (13,625 | )

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