Parent Company Only Financial Information - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements Captions [Line Items]
Income taxes paid	$ 38,803	$ 2,701	$ 15,259
Trustmark Corp (Parent Company Only) [Member]
Condensed Financial Statements Captions [Line Items]
Income taxes paid	38,800	2,700	15,300
Interest paid	$ 4,500	$ 4,500	$ 4,600