Legal Entity [Axis] Statements of Net Assets Available for Benefits [Abstract] Net assets available for benefits Beginning of year End of year Net assets available for benefits per the financial statements Statements of Changes in Net Assets Available for Benefits [Abstract] Total contributions Total net investment income Total net investment income per the financial statements Total deductions Net increase in net assets available for benefits Plan Description [Abstract] Significant Accounting Policies [Abstract] Risks and Uncertainties [Abstract] Tax Status [Abstract] Party-In-Interest Transactions [Abstract] Fair Value Measurements [Abstract] Fair Value Hierarchy and NAV [Axis] Investment Type [Axis] Reconciliation of Financial Statements to Form 5500 [Abstract] Net assets available for plan benefits per the Form 5500 Total investment income per Form 5500 SECURE ACT 2.0 [Abstract] Subsequent Events [Abstract] Schedule H, Line 4(i) – Schedule of Assets (Held at End of Year) [Abstract] Statistical Measurement [Axis] Document Type Document Period End Date Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Amendment Flag Investments, at fair value Investments Value of shares held by the Plan (in Dollars) Notes receivable from participants Employer contributions receivable Participant contributions receivable Contributions Employer Company contributions (in Dollars) Participant Rollovers/Other Net investment income Net appreciation in fair value of investments Interest and dividends Interest income from notes receivable from participants Deductions Net assets available for benefits Benefits paid to participants Fees Trustmark 401(k) Plan [Member] Trustmark 401(k) Plan [Membr] Plan Description Significant Accounting Policies Risks and Uncertainties Tax Status Party-In-Interest Transactions Fair Value Measurements Fair Value Measurements for Plan’s Assets and NAV Per Share Unfunded Commitments Redemption Frequency Redemption Notice Period Reconciliation of Financial Statements to Form 5500 Reconciliation of Net Assets Available for Benefits and Investment Income Per the Financial Statements to the Corresponding Amounts Shown in the Plan's Form 5500 Adjustment from fair value to current value on collective investment funds Adjustment from fair value to current value on collective investment funds SECURE ACT 2.0 Subsequent Events Schedule H, Line 4(i) – Schedule of Assets (Held at End of Year) Identity of Issue, Borrower, Lessor or Similar Party Participation Status Current Value Description of Investment Party-in-interest Notes receivable from participants Notes receivable from participants, interest rate Total assets (held at end of year) Fair value Fair Value Hierarchy [Member] Investments at Fair Value Hierarchy [Member] Mutual Funds [Member] Common Stock of Trustmark Corporation [Member] Common Stock [Member] Self-directed Brokerage Accounts [Member] Employee Benefit Plan Self Directed Brokerage Account [Member] Collective Investment Funds [Member] Pooled Separate Account [Member] Level 1 [Member] NAV Per Share [Member] Investment, Identifier [Axis] Notes Receivable from Participants [Member] Minimum [Member] Maximum [Member] EBP, Contribution, Participating Employer [Axis] Plan agreement description Employment period required for eligibility for participation in elective deferrals in the Plan Deferral rate Deferral rate, automatically annual increase Maximum percent of eligible compensation each period participants may elect to contribute Minimum age participants will be eligible to make catch-up contributions (in Age) Employment period required for eligibility for receive the safe harbor matching contribution Eligible participant contributions, matched employer rate Maximum percent of eligible participant contributions that are matched by employer at a rate of 100% Minimum amount participants may borrow from their vested account balance (in Dollars) Maximum amount participants may borrow from their vested account balance (in Dollars) Maximum percentage of vested account balance that participants may borrow Notes receivable from participants, maturity date Notes receivable from participants, repayment term Notes receivable from participants, repayment term Allowance for credit losses IRS determination letter, obtained IRS determination letter, date Dividends received (in Dollars) Number of shares held by the Plan (in Shares) Number of shares purchased by the Plan (in Shares) Number of shares sold by the Plan (in Shares) Plan Name EIN Plan Number Basis of Presentation Use of Estimates Investments Notes Receivable from Participants Contributions Payment of Benefits Net Appreciation in Fair Value of Investments Administrative Fees Discretionary Contributions [Member] Notes Receivable Used to Purchase Primary Residence [Member] Level 2 [Member] Level 3 [Member] Entity [Domain] EBP, Statement of Net Asset Available for Benefit [Table] Statements of Net Assets Available for Benefits [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] Statements of Changes in Net Assets Available for Benefits [Abstract] EBP, Description of Plan [Table] Plan Description [Abstract] EBP, Accounting Policy [Table] Significant Accounting Policies [Abstract] EBP, Risk and Uncertainty [Table] Risks and Uncertainties [Abstract] EBP, Tax Status [Table] Tax Status [Abstract] EBP, Related Party and Party-in-Interest Transactions [Table] Party-In-Interest Transactions [Abstract] EBP, Investment, Fair Value and NAV [Table] Fair Value Measurements [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Reconciliation of Financial Statements to Form 5500 [Abstract] EBP, Secure Act 2.0 [Table] SECURE ACT 2.0 [Abstract] EBP, Subsequent Event [Table] Subsequent Events [Abstract] EBP, Schedule of Asset Held for Investment [Table] Schedule H, Line 4(i) – Schedule of Assets (Held at End of Year) [Abstract] EBP, Accounting Policy [Line Items] Fair Value Hierarchy and NAV [Domain] Investments [Domain] Statistical Measurement [Domain] EBP, Contribution, Participating Employer [Domain] Period of repayment of loan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Period of repayment of loan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Percentage of increase in automatic contribution rate that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation. The period of employment an employee is required to complete before becoming eligible to participate in the employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). The period of employment an employee is required to complete before becoming eligible to receive safe harbor matching contribution in the employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). The age at which participants become eligible for contributions under employee benefit plan. The entire disclosure for SECURE 2.0 Act of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).. Disclosure of accounting policy for basis used to net appreciation in fair value of investments to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participating in master trust arrangement. Disclosure of information about Secure Act 2.0. Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. T. Rowe Price - Retirement Balanced Trust Fund [Member] Mutual Funds [Member] Participant or Beneficiary Directed [Member] T. Rowe Price - Retirement 2055 Trust Fund [Member] Self-directed Brokerage Accounts [Member] T. Rowe Price - Retirement 2010 Trust Fund [Member] Allspring - Common Stock R6 Fund [Member] T. Rowe Price - Retirement 2015 Trust Fund [Member] T. Rowe Price - Retirement 2045 Trust Fund [Member] Collective Investment Funds [Member] Vanguard - Total Bond Market Index Admiral Fund [Member] Common Stock [Member] Vanguard - Equity-Income Admiral Fund [Member] Putnam - Stable Value Fund [Member] Invesco - International Small Mid Co Fund Y [Member] Empower - Jennison Large Cap Growth Fund [Member] T. Rowe Price - Retirement 2030 Trust Fund [Member] T. Rowe Price - Retirement 2060 Trust Fund [Member] Trustmark Corporation - Common Stock [Member] Charles Schwab & Co., Inc. - Various Exchange Traded Funds [Member] John Hancock - Alternative Asset Allocation Fund I [Member] T. Rowe Price - Retirement 2035 Trust Fund [Member] Charles Schwab & Co., Inc. - Cash & Cash Equivalents [Member] Legg Mason - BW Global Opportunities Bond Fund [Member] T. Rowe Price - Retirement 2050 Trust Fund [Member] Vanguard - Mid Cap Index Institutional Fund [Member] T. Rowe Price - Retirement 2020 Trust Fund [Member] Baird - Core Plus Bond Institutional Fund [Member] Charles Schwab & Co., Inc. - Various Mutual Funds [Member] Pooled Separate Account [Member] Vanguard - Institutional Index Fund [Member] Vanguard - Total International Stock Index Institutional Fund [Member] T. Rowe Price - Retirement 2025 Trust Fund [Member] Vanguard - Small Cap Index Institutional Fund [Member] T. Rowe Price - Retirement 2040 Trust Fund [Member] American Funds - Euro Pacific Growth Fund R6 [Member] Vanguard - Inflation-Protected Securities Admiral Fund [Member] Employee Benefit Plan Secure ACT20 Text Block EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant EBP, Investment, Sold, Number of Shares EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Employer, Common Stock [Member] EBP, Participant Contribution, Automatic, Deferral Rate EBP, Employer Contribution, Participant Compensation Matched, Percentage Fair Value, Inputs, Level 3 [Member] EBP, Employer Contribution, Matching Percentage EBP, Plan Number EBP, Form 5500 Caption, Net Gain (Loss) on Sale of Assets EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] EBP, Self-Directed Brokerage Account [Member] EBP, Note Receivable from Participant [Policy Text Block] EBP, Fair Value, Investment, NAV, Redemption, Description EBP, Pooled Separate Account [Member] EBP, Investment, Fair Value and NAV [Table Text Block] EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Notes Receivable Used To Purchase Primary Residence Member EBP, Form 5500 Caption, Net Assets EBP, Description, Available [true false] Employee Benefit Plan Secure Act20 Line Items EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Expense [Policy Text Block] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Contract Value to Current Value EBP002 Member Fair Value, Inputs, Level 1 [Member] EBP, Asset Held for Investment, Participant Loan, Maturity Date Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Summary of Accounting Policy [Text Block] EBP, Tax Status [Text Block] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Note Receivable from Participant Employee Benefit Plan Note Receivable From Participant Account Maximum Borrowing Term EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Discretionary Contributions Member Fair Value Measured at Net Asset Value Per Share [Member] EBP, Change in Net Asset Available for Benefit, Increase from Contribution EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Purchased, Number of Shares EBP, Use of Estimate [Policy Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee Benefit Plan Participant Minimum Age Eligible To Make Pretax Catchup Contributions Net Appreciation In Fair Value Of Investments Policy Text Block EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Subsequent Event [Line Items] EBP, Description of Plan [Text Block] Document Fiscal Year Focus EBP, Tax Determination Letter, Date EBP, Asset Held for Investment, Participant Loan, Interest Rate Employee Benefit Plan Participant Contribution Automatic Annual Increase In Deferral Rate EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Subsequent Event [Text Block] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Investment, Fair Value Minimum [Member] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Investment, Number of Shares EBP, Description of Plan [Line Items] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Fair Value, Inputs, Level 2 [Member] EBP, Risk and Uncertainty [Text Block] EBP, Fair Value, Investment, NAV, Redemption, Notice Period EBP, Change in Net Asset Available for Benefit, Decrease EBP, Basis of Accounting [Policy Text Block] EBP, Investment, Fair Value and NAV [Line Items] EBP, Asset Held for Investment EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Net Asset Available for Benefit EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment EBP, Investment [Policy Text Block] Maximum [Member] EBP, Schedule of Asset Held for Investment [Line Items] Document Type EBP, Employer Contribution, Receivable EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Entity Tax Identification Number EBP, Contribution [Policy Text Block] Amendment Flag Notes Receivable From Participants Member EBP, Tax Status [Line Items] Document Period End Date Employee Benefit Plan Participant Employment Period Required For Eligibility To Participate In Plan EBP, Participant Contribution, Receivable EBP, Investment, Fair Value and NAV [Text Block] EBP, Schedule of Asset Held for Investment [Table Text Block] EBP, Risk and Uncertainty [Line Items] Entity Central Index Key EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Fair Value, Investment, NAV, Unfunded Commitment Employee Benefit Plan Note Receivable From Participant Principal Residence Maximum Borrowing Term Investment, Identifier [Axis] Employee Benefit Plan Participant Employment Period Required To Receive Safe Harbor Matching Contribution EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover EBP, Plan Name EBP, Payment to Participant [Policy Text Block] Entity Registrant Name EBP, Note Receivable from Participant, Allowance for Credit Loss EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Tax Determination Letter, Obtained [true false]