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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2025
Revenue from Contract with Customer [Abstract] |
Summary of Noninterest Income (Loss) Disaggregated by Reportable Operating Segment and Revenue Stream | The following table presents noninterest income (loss) disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands):
|  | Year Ended December 31, 2025 |  |  | Year Ended December 31, 2024 |  |  | Year Ended December 31, 2023 |
|  | Topic 606 |  |  | Not Topic 606 (1) |  |  | Total |  |  | Topic 606 |  |  | Not Topic 606 (1) |  |  | Total |  |  | Topic 606 |  |  | Not Topic 606 (1) |  |  | Total |
General Banking Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service charges on deposit accounts |  | $ | 43,477 |  |  | $ | — |  |  | $ | 43,477 |  |  | $ | 44,295 |  |  | $ | — |  |  | $ | 44,295 |  |  | $ | 43,329 |  |  | $ | — |  |  | $ | 43,329 |
Bank card and other fees |  |  | 30,690 |  |  |  | 2,497 |  |  |  | 33,187 |  |  |  | 31,010 |  |  |  | 2,138 |  |  |  | 33,148 |  |  |  | 30,387 |  |  |  | 2,995 |  |  |  | 33,382 |
Mortgage banking, net |  |  | — |  |  |  | 33,082 |  |  |  | 33,082 |  |  |  | — |  |  |  | 26,626 |  |  |  | 26,626 |  |  |  | — |  |  |  | 26,216 |  |  |  | 26,216 |
Wealth management |  |  | 713 |  |  |  | — |  |  |  | 713 |  |  |  | 748 |  |  |  | — |  |  |  | 748 |  |  |  | 838 |  |  |  | — |  |  |  | 838 |
Other, net |  |  | 13,120 |  |  |  | (382 | ) |  |  | 12,738 |  |  |  | 16,906 |  |  |  | 337 |  |  |  | 17,243 |  |  |  | 11,769 |  |  |  | (2,076 | ) |  |  | 9,693 |
Securities gains (losses), net |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (182,792 | ) |  |  | (182,792 | ) |  |  | — |  |  |  | 39 |  |  |  | 39 |
Total noninterest income (loss) |  | $ | 88,000 |  |  | $ | 35,197 |  |  | $ | 123,197 |  |  | $ | 92,959 |  |  | $ | (153,691 | ) |  | $ | (60,732 | ) |  | $ | 86,323 |  |  | $ | 27,174 |  |  | $ | 113,497 |
Wealth Management Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service charges on deposit accounts |  | $ | 179 |  |  | $ | — |  |  | $ | 179 |  |  | $ | 87 |  |  | $ | — |  |  | $ | 87 |  |  | $ | 87 |  |  | $ | — |  |  | $ | 87 |
Bank card and other fees |  |  | 195 |  |  |  | — |  |  |  | 195 |  |  |  | 153 |  |  |  | — |  |  |  | 153 |  |  |  | 57 |  |  |  | — |  |  |  | 57 |
Wealth management |  |  | 39,399 |  |  |  | — |  |  |  | 39,399 |  |  |  | 36,503 |  |  |  | — |  |  |  | 36,503 |  |  |  | 34,254 |  |  |  | — |  |  |  | 34,254 |
Other, net |  |  | 286 |  |  |  | 384 |  |  |  | 670 |  |  |  | 193 |  |  |  | 377 |  |  |  | 570 |  |  |  | 162 |  |  |  | 376 |  |  |  | 538 |
Total noninterest income |  | $ | 40,059 |  |  | $ | 384 |  |  | $ | 40,443 |  |  | $ | 36,936 |  |  | $ | 377 |  |  | $ | 37,313 |  |  | $ | 34,560 |  |  | $ | 376 |  |  | $ | 34,936 |
Consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service charges on deposit accounts |  | $ | 43,656 |  |  | $ | — |  |  | $ | 43,656 |  |  | $ | 44,382 |  |  | $ | — |  |  | $ | 44,382 |  |  | $ | 43,416 |  |  | $ | — |  |  | $ | 43,416 |
Bank card and other fees |  |  | 30,885 |  |  |  | 2,497 |  |  |  | 33,382 |  |  |  | 31,163 |  |  |  | 2,138 |  |  |  | 33,301 |  |  |  | 30,444 |  |  |  | 2,995 |  |  |  | 33,439 |
Mortgage banking, net |  |  | — |  |  |  | 33,082 |  |  |  | 33,082 |  |  |  | — |  |  |  | 26,626 |  |  |  | 26,626 |  |  |  | — |  |  |  | 26,216 |  |  |  | 26,216 |
Wealth management |  |  | 40,112 |  |  |  | — |  |  |  | 40,112 |  |  |  | 37,251 |  |  |  | — |  |  |  | 37,251 |  |  |  | 35,092 |  |  |  | — |  |  |  | 35,092 |
Other, net |  |  | 13,406 |  |  |  | 2 |  |  |  | 13,408 |  |  |  | 17,099 |  |  |  | 714 |  |  |  | 17,813 |  |  |  | 11,931 |  |  |  | (1,700 | ) |  |  | 10,231 |
Securities gains (losses), net |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (182,792 | ) |  |  | (182,792 | ) |  |  | — |  |  |  | 39 |  |  |  | 39 |
Total noninterest income (loss) |  | $ | 128,059 |  |  | $ | 35,581 |  |  | $ | 163,640 |  |  | $ | 129,895 |  |  | $ | (153,314 | ) |  | $ | (23,419 | ) |  | $ | 120,883 |  |  | $ | 27,550 |  |  | $ | 148,433 |
(1) Noninterest income (loss) not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and securities gains (losses), net.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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