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Deposits - Interest Expense on Deposits by Type (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest expense on deposits by type [Abstract]
Interest-bearing demand	[1]	$ 146,053	$ 178,470	$ 149,142
Savings	[1]	512	539	601
Time		128,091	150,372	96,208
Total		$ 274,656	$ 329,381	$ 245,951
[1] (1) During the first quarter of 2025, Trustmark ceased the daily sweep from low transaction interest-bearing demand deposits to savings deposits. The prior periods have been reclassified accordingly.

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- Definition

Interest expense on deposits by type [Abstract]

+ References

No definition available.

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- Definition

Interest expense incurred on demand deposit accounts that represent borrowings rather than outstanding drafts.

+ References

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-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(6))
-Publisher FASB
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- Definition

Aggregate amount of interest expense on all deposits.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
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- Definition

Interest expense incurred on all savings account deposits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph b
-Subparagraph (1)
-Publisher SEC

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- Definition

The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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-Name Regulation S-K (SK)
-Number 229
-Section 1402
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