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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2025 and December 31, 2024 ($ in thousands):
|  | Actual |  |  |  |  |  |  |
|  | Regulatory Capital |  |  | Minimum |  |  | To Be Well |
|  | Amount |  |  | Ratio |  |  | Requirement |  |  | Capitalized |
At June 30, 2025: |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,779,568 |  |  |  | 11.70 | % |  |  | 7.00 | % |  | n/a |
Trustmark Bank |  |  | 1,864,379 |  |  |  | 12.26 | % |  |  | 7.00 | % |  |  | 6.50 | %
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,839,568 |  |  |  | 12.09 | % |  |  | 8.50 | % |  | n/a |
Trustmark Bank |  |  | 1,864,379 |  |  |  | 12.26 | % |  |  | 8.50 | % |  |  | 8.00 | %
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 2,153,616 |  |  |  | 14.15 | % |  |  | 10.50 | % |  | n/a |
Trustmark Bank |  |  | 2,054,586 |  |  |  | 13.51 | % |  |  | 10.50 | % |  |  | 10.00 | %
Tier 1 Leverage (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,839,568 |  |  |  | 10.15 | % |  |  | 4.00 | % |  | n/a |
Trustmark Bank |  |  | 1,864,379 |  |  |  | 10.29 | % |  |  | 4.00 | % |  |  | 5.00 | %
At December 31, 2024: |  |  |  |  |  |  |  |  |  |  |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,729,672 |  |  |  | 11.54 | % |  |  | 7.00 | % |  | n/a |
Trustmark Bank |  |  | 1,828,044 |  |  |  | 12.20 | % |  |  | 7.00 | % |  |  | 6.50 | %
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,789,672 |  |  |  | 11.94 | % |  |  | 8.50 | % |  | n/a |
Trustmark Bank |  |  | 1,828,044 |  |  |  | 12.20 | % |  |  | 8.50 | % |  |  | 8.00 | %
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 2,094,874 |  |  |  | 13.97 | % |  |  | 10.50 | % |  | n/a |
Trustmark Bank |  |  | 2,009,544 |  |  |  | 13.41 | % |  |  | 10.50 | % |  |  | 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 table presents the net change in the components of accumulated other comprehensive income (loss) and the related tax effects allocated to each component for the periods presented ($ in thousands).
|  | Three Months Ended June 30, 2025 |  |  | Three Months Ended June 30, 2024 |
|  | Before Tax Amount |  |  | Tax (Expense) Benefit |  |  | Net of Tax Amount |  |  | Before Tax Amount |  |  | Tax (Expense) Benefit |  |  | Net of Tax Amount |
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized holding gains (losses) arising during the period |  | $ | 13,992 |  |  | $ | (3,499 | ) |  | $ | 10,493 |  |  | $ | (5,761 | ) |  | $ | 1,440 |  |  | $ | (4,321 | )
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 |  |  | 3,450 |  |  |  | (863 | ) |  |  | 2,587 |  |  |  | 3,671 |  |  |  | (918 | ) |  |  | 2,753 |
Total securities available for sale and transferred securities |  |  | 17,442 |  |  |  | (4,362 | ) |  |  | 13,080 |  |  |  | 180,702 |  |  |  | (45,176 | ) |  |  | 135,526 |
Pension and other postretirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments for changes realized in net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in prior service costs |  |  | 3 |  |  |  | — |  |  |  | 3 |  |  |  | 27 |  |  |  | (7 | ) |  |  | 20 |
Recognized net loss due to lump sum settlements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (13 | ) |  |  | 3 |  |  |  | (10 | )
Change in net actuarial loss |  |  | 61 |  |  |  | (16 | ) |  |  | 45 |  |  |  | 84 |  |  |  | (20 | ) |  |  | 64 |
Total pension and other postretirement benefit plans |  |  | 64 |  |  |  | (16 | ) |  |  | 48 |  |  |  | 98 |  |  |  | (24 | ) |  |  | 74 |
Cash flow hedge derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accumulated gain (loss) on effective cash flow hedge derivatives |  |  | 4,098 |  |  |  | (1,024 | ) |  |  | 3,074 |  |  |  | (4,873 | ) |  |  | 1,218 |  |  |  | (3,655 | )
Reclassification adjustment for (gain) loss realized in net income |  |  | 2,681 |  |  |  | (670 | ) |  |  | 2,011 |  |  |  | 4,869 |  |  |  | (1,217 | ) |  |  | 3,652 |
Total cash flow hedge derivatives |  |  | 6,779 |  |  |  | (1,694 | ) |  |  | 5,085 |  |  |  | (4 | ) |  |  | 1 |  |  |  | (3 | )
Total other comprehensive income (loss) |  | $ | 24,285 |  |  | $ | (6,072 | ) |  | $ | 18,213 |  |  | $ | 180,796 |  |  | $ | (45,199 | ) |  | $ | 135,597 |
|  | Six Months Ended June 30, 2025 |  |  | Six Months Ended June 30, 2024 |
|  | Before Tax Amount |  |  | Tax (Expense) Benefit |  |  | Net of Tax Amount |  |  | Before Tax Amount |  |  | Tax (Expense) Benefit |  |  | Net of Tax Amount |
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized holding gains (losses) arising during the period |  | $ | 46,591 |  |  | $ | (11,648 | ) |  | $ | 34,943 |  |  | $ | (8,313 | ) |  | $ | 2,078 |  |  | $ | (6,235 | )
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 |  |  | 6,875 |  |  |  | (1,719 | ) |  |  | 5,156 |  |  |  | 7,332 |  |  |  | (1,833 | ) |  |  | 5,499 |
Total securities available for sale and transferred securities |  |  | 53,466 |  |  |  | (13,367 | ) |  |  | 40,099 |  |  |  | 181,811 |  |  |  | (45,453 | ) |  |  | 136,358 |
Pension and other postretirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments for changes realized in net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in prior service costs |  |  | 7 |  |  |  | (1 | ) |  |  | 6 |  |  |  | 55 |  |  |  | (14 | ) |  |  | 41 |
Recognized net loss due to lump sum settlements |  |  | (50 | ) |  |  | 12 |  |  |  | (38 | ) |  |  | (13 | ) |  |  | 3 |  |  |  | (10 | )
Change in net actuarial loss |  |  | 132 |  |  |  | (33 | ) |  |  | 99 |  |  |  | 179 |  |  |  | (44 | ) |  |  | 135 |
Total pension and other postretirement benefit plans |  |  | 89 |  |  |  | (22 | ) |  |  | 67 |  |  |  | 221 |  |  |  | (55 | ) |  |  | 166 |
Cash flow hedge derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accumulated gain (loss) on effective cash flow hedge derivatives |  |  | 11,977 |  |  |  | (2,994 | ) |  |  | 8,983 |  |  |  | (20,833 | ) |  |  | 5,208 |  |  |  | (15,625 | )
Reclassification adjustment for (gain) loss realized in net income |  |  | 5,361 |  |  |  | (1,340 | ) |  |  | 4,021 |  |  |  | 9,689 |  |  |  | (2,422 | ) |  |  | 7,267 |
Total cash flow hedge derivatives |  |  | 17,338 |  |  |  | (4,334 | ) |  |  | 13,004 |  |  |  | (11,144 | ) |  |  | 2,786 |  |  |  | (8,358 | )
Total other comprehensive income (loss) |  | $ | 70,893 |  |  | $ | (17,723 | ) |  | $ | 53,170 |  |  | $ | 170,888 |  |  | $ | (42,722 | ) |  | $ | 128,166 |
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 Derivatives |  |  | Total |
Balance at January 1, 2025 | $ | (66,885 | ) |  | $ | (4,721 | ) |  | $ | (12,053 | ) |  | $ | (83,659 | )
Other comprehensive income (loss) before reclassification |  | 40,099 |  |  |  | — |  |  |  | 8,983 |  |  |  | 49,082 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | — |  |  |  | 67 |  |  |  | 4,021 |  |  |  | 4,088 |
Net other comprehensive income (loss) |  | 40,099 |  |  |  | 67 |  |  |  | 13,004 |  |  |  | 53,170 |
Balance at June 30, 2025 | $ | (26,786 | ) |  | $ | (4,654 | ) |  | $ | 951 |  |  | $ | (30,489 | )
Balance at January 1, 2024 | $ | (204,670 | ) |  | $ | (6,075 | ) |  | $ | (8,978 | ) |  | $ | (219,723 | )
Other comprehensive income (loss) before reclassification |  | (736 | ) |  |  | — |  |  |  | (15,625 | ) |  |  | (16,361 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  | 137,094 |  |  |  | 166 |  |  |  | 7,267 |  |  |  | 144,527 |
Net other comprehensive income (loss) |  | 136,358 |  |  |  | 166 |  |  |  | (8,358 | ) |  |  | 128,166 |
Balance at June 30, 2024 | $ | (68,312 | ) |  | $ | (5,909 | ) |  | $ | (17,336 | ) |  | $ | (91,557 | )

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