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Revenue from Contracts with Customers - Summary of Noninterest Income (Loss) Disaggregated by Reportable Operating Segment and Revenue Stream (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Revenue From Contract With Customer [Line Items] |  |  |  |
Service charges on deposit accounts |  | $ 43,656 | $ 44,382 | $ 43,416
Bank card and other fees |  | 33,382 | 33,301 | 33,439
Mortgage banking, net |  | 33,082 | 26,626 | 26,216
Wealth management |  | 40,112 | 37,251 | 35,092
Other, net |  | 13,408 | 17,813 | 10,231
Securities gains (losses), net |  | 0 | (182,792) | 39
Total Noninterest Income (loss) |  | 163,640 | (23,419) | 148,433
Topic 606 [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Service charges on deposit accounts |  | 43,656 | 44,382 | 43,416
Bank card and other fees |  | 30,885 | 31,163 | 30,444
Wealth management |  | 40,112 | 37,251 | 35,092
Other, net |  | 13,406 | 17,099 | 11,931
Total Noninterest Income (loss) |  | 128,059 | 129,895 | 120,883
Not Topic 606 [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Bank card and other fees | [1] | 2,497 | 2,138 | 2,995
Mortgage banking, net | [1] | 33,082 | 26,626 | 26,216
Other, net | [1] | 2 | 714 | (1,700)
Securities gains (losses), net | [1] |  | (182,792) | 39
Total Noninterest Income (loss) | [1] | 35,581 | (153,314) | 27,550
General Banking Segment [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Service charges on deposit accounts |  | 43,477 | 44,295 | 43,329
Bank card and other fees |  | 33,187 | 33,148 | 33,382
Mortgage banking, net |  | 33,082 | 26,626 | 26,216
Wealth management |  | 713 | 748 | 838
Other, net |  | 12,738 | 17,243 | 9,693
Securities gains (losses), net |  |  | (182,792) | 39
Total Noninterest Income (loss) |  | 123,197 | (60,732) | 113,497
General Banking Segment [Member] | Topic 606 [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Service charges on deposit accounts |  | 43,477 | 44,295 | 43,329
Bank card and other fees |  | 30,690 | 31,010 | 30,387
Wealth management |  | 713 | 748 | 838
Other, net |  | 13,120 | 16,906 | 11,769
Total Noninterest Income (loss) |  | 88,000 | 92,959 | 86,323
General Banking Segment [Member] | Not Topic 606 [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Bank card and other fees | [1] | 2,497 | 2,138 | 2,995
Mortgage banking, net | [1] | 33,082 | 26,626 | 26,216
Other, net | [1] | (382) | 337 | (2,076)
Securities gains (losses), net | [1] |  | (182,792) | 39
Total Noninterest Income (loss) | [1] | 35,197 | (153,691) | 27,174
Wealth Management Segment [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Service charges on deposit accounts |  | 179 | 87 | 87
Bank card and other fees |  | 195 | 153 | 57
Mortgage banking, net |  | 0 | 0 | 0
Wealth management |  | 39,399 | 36,503 | 34,254
Other, net |  | 670 | 570 | 538
Securities gains (losses), net |  |  | 0 | 0
Total Noninterest Income (loss) |  | 40,443 | 37,313 | 34,936
Wealth Management Segment [Member] | Topic 606 [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Service charges on deposit accounts |  | 179 | 87 | 87
Bank card and other fees |  | 195 | 153 | 57
Wealth management |  | 39,399 | 36,503 | 34,254
Other, net |  | 286 | 193 | 162
Total Noninterest Income (loss) |  | 40,059 | 36,936 | 34,560
Wealth Management Segment [Member] | Not Topic 606 [Member] |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |
Other, net | [1] | 384 | 377 | 376
Total Noninterest Income (loss) | [1] | $ 384 | $ 377 | $ 376
[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 Income earned from bank card and credit card services including late, over limit, and annual fees. This item excludes interest income earned on credit card balances and transactions. Includes interchange fees earned from bank card and credit card transactions. Also includes ATM and other banking fees. + References No definition available. + Details
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- Definition The noninterest income, net of associated expenses, derived from mortgage banking activities (fees and commissions), including fees earned from servicing third-party assets. + References No definition available. + Details
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- Definition Revenue from contract with customer. + References No definition available. + Details
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- Definition Service charges on deposit accounts. + References No definition available. + Details
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- Definition Gross income from services rendered by the trust department acting in any fiduciary capacity. Also include fees and commissions from securities brokerage activities, investment advisory and management services and from sales of annuities (fixed, variable, and other). + References No definition available. + Details
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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-21 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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