Parent Company Only Financial Information - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements Captions [Line Items]
Income taxes paid	$ 2,701,000	$ 15,259,000	$ 46,648,000
Trustmark Corp (Parent Company Only) [Member]
Condensed Financial Statements Captions [Line Items]
Income taxes paid	2,700,000	15,300,000	46,600,000
Interest paid	$ 4,500,000	$ 4,600,000	0
Interest received			$ 0