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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value of Derivative Instruments | The following tables disclose the fair value of derivative instruments in Trustmark’s consolidated balance sheets at December 31, 2025 and 2024 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands):
|  | December 31, |
|  | 2025 |  |  | 2024 |
Derivatives in hedging relationships |  |  |  |  |  |
Interest rate contracts: |  |  |  |  |  |
Interest rate swaps included in other assets (1) |  | $ | 3,890 |  |  | $ | 74 |
Interest rate floors included in other assets |  |  | 1,673 |  |  |  | 1,582 |
Interest rate swaps included in other liabilities (1) |  |  | 611 |  |  |  | 5,958 |
Derivatives not designated as hedging instruments |  |  |  |  |  |
Interest rate contracts: |  |  |  |  |  |
Exchange traded purchased options included in other assets |  | $ | 11 |  |  | $ | 18 |
OTC written options (rate locks) included in other assets |  |  | 998 |  |  |  | 229 |
Interest rate swaps included in other assets (1) |  |  | 9,654 |  |  |  | 13,478 |
Credit risk participation agreements included in other assets |  |  | 9 |  |  |  | 16 |
Futures contracts included in other liabilities |  |  | 1,661 |  |  |  | 1,972 |
Forward contracts included in other liabilities |  |  | 287 |  |  |  | (679 | )
Exchange traded written options included in other liabilities |  |  | 47 |  |  |  | 211 |
Interest rate swaps included in other liabilities (1) |  |  | 20,098 |  |  |  | 33,817 |
Credit risk participation agreements included in other liabilities |  |  | 128 |  |  |  | 76 |
(1) In accordance with GAAP, the variation margin collateral payments made or received for interest rate swaps that are centrally cleared are legally characterized as settled. As a result, the centrally cleared interest rate swaps included in other assets and other liabilities are presented on a net basis in the accompanying consolidated balance sheets.
Effects of Derivative Instruments on Statements of Operations |
|  | Years Ended December 31, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Derivatives in hedging relationships |  |  |  |  |  |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) and recognized in interest and fees on LHFS & LHFI |  | $ | (9,521 | ) |  | $ | (18,132 | ) |  | $ | (16,385 | )
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in mortgage banking, net |  | $ | 7,081 |  |  | $ | (13,965 | ) |  | $ | (5,281 | )
Amount of gain (loss) recognized in bank card and other fees |  |  | 706 |  |  |  | 135 |  |  |  | 271 |
Schedule of Amount Included in Other Comprehensive Income for Derivative Instruments Designated as Hedges of Cash Flows | The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented ($ in thousands):
|  | Years Ended December 31, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Derivatives in cash flow hedging relationship |  |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax |  | $ | 6,974 |  |  | $ | (16,674 | ) |  | $ | (6,098 | )
Information about Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheets | Information about financial instruments that are eligible for offset in the consolidated balance sheets at December 31, 2025 and 2024 is presented in the following tables ($ in thousands):
Offsetting of Derivative Assets |
As of December 31, 2025 |
|  |  |  |  |  |  |  |  |  |  | Gross Amounts Not Offset in the Statement of Financial Position |  |  |  |
|  | Gross Amounts of Recognized Assets |  |  | Gross Amounts Offset in the Statement of Financial Position |  |  | Net Amounts of Assets presented in the Statement of Financial Position |  |  | Financial Instruments |  |  | Cash Collateral Received |  |  | Net Amount |
Derivatives |  | $ | 15,217 |  |  | $ | — |  |  | $ | 15,217 |  |  | $ | (6,271 | ) |  | $ | (1,380 | ) |  | $ | 7,566 |
Offsetting of Derivative Liabilities |
As of December 31, 2025 |
|  |  |  |  |  |  |  |  |  |  | Gross Amounts Not Offset in the Statement of Financial Position |  |  |  |
|  | Gross Amounts of Recognized Liabilities |  |  | Gross Amounts Offset in the Statement of Financial Position |  |  | Net Amounts of Liabilities presented in the Statement of Financial Position |  |  | Financial Instruments |  |  | Cash Collateral Posted |  |  | Net Amount |
Derivatives |  | $ | 20,709 |  |  | $ | — |  |  | $ | 20,709 |  |  | $ | (6,271 | ) |  | $ | (2,200 | ) |  | $ | 12,238 |
Offsetting of Derivative Assets |
As of December 31, 2024 |
|  |  |  |  |  |  |  |  |  |  | Gross Amounts Not Offset in the Statement of Financial Position |  |  |  |
|  | Gross Amounts of Recognized Assets |  |  | Gross Amounts Offset in the Statement of Financial Position |  |  | Net Amounts of Assets presented in the Statement of Financial Position |  |  | Financial Instruments |  |  | Cash Collateral Received |  |  | Net Amount |
Derivatives |  | $ | 15,134 |  |  | $ | — |  |  | $ | 15,134 |  |  | $ | (7,956 | ) |  | $ | (2,000 | ) |  | $ | 5,178 |
Offsetting of Derivative Liabilities |
As of December 31, 2024 |
|  |  |  |  |  |  |  |  |  |  | Gross Amounts Not Offset in the Statement of Financial Position |  |  |  |
|  | Gross Amounts of Recognized Liabilities |  |  | Gross Amounts Offset in the Statement of Financial Position |  |  | Net Amounts of Liabilities presented in the Statement of Financial Position |  |  | Financial Instruments |  |  | Cash Collateral Posted |  |  | Net Amount |
Derivatives |  | $ | 39,775 |  |  | $ | — |  |  | $ | 39,775 |  |  | $ | (7,956 | ) |  | $ | (1,460 | ) |  | $ | 30,359 |

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