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v3.25.4

Borrowings - Junior Subordinated Debt Securities - Additional information (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 18, 2006 USD ($) qtr | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items] |  |  |  |
Junior subordinated debt securities |  | $ 61,856 | $ 61,856 |
Total assets |  | 18,925,211 | 18,152,422 |
Total liabilities and shareholders' equity |  | 18,925,211 | 18,152,422 |
Common securities |  | 12,296 | 12,711 |
Net income |  | 224,135 | 223,009 | $ 165,489
Trustmark Preferred Capital Trust I [Member] | Junior Subordinated Debt Securities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Face amount of debt issued | $ 60,000 |  |  |
Maturity date | Sep. 30, 2036 |  |  |
Variable interest rate, description | three-month Chicago Mercantile Exchange, Inc. (CME) SOFR |  |  |
Basis spread over SOFR rate (in hundredths) | 0.26% |  |  |
Debt instrument interest rate margin | 1.72% |  |  |
Junior subordinated debt securities | $ 61,900 |  |  |
Consecutive quarters that Trustmark may defer interest payments | qtr | 20 |  |  |
Total assets |  | 61,900 | 61,900 |
Total liabilities and shareholders' equity |  | 61,900 | 61,900 |
Trust preferred securities |  | 60,000 | 60,000 |
Common securities |  | 1,900 | 1,900 |
Net income |  | 117 | 134 | 132
Dividends paid |  | $ 117 | $ 134 | $ 132

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