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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
		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.

X

- 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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X

- 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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X

- Definition

Revenue from contract with customer.

+ References

No definition available.

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- Definition

Service charges on deposit accounts.

+ References

No definition available.

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X

- 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.

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X

- 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

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X

- 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

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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

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