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100280 - Disclosure - Accounting Policies Recently Adopted and Pending Accounting Pronouncements (Policies)
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100470 - Disclosure - Business, Basis of Financial Statement Presentation and Principles of Consolidation (Details)
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100480 - Disclosure - Securities Available for Sale and Held to Maturity - Additional Information (Details)
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100490 - Disclosure - Securities Available for Sale and Held to Maturity - Securities Held to Maturity by Credit Rating, as Determined by Moody's (Details)
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100580 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Impact of Modifications Classified as Troubled Debt Restructurings (Details)
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100600 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Related to Loans Held for Investment, Excluding Covered Loans, by Loan Type (Details)
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100610 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Schedule ofAmortized Cost Basis of Collateral-Dependent Loans by Class of Loans and Collateral Type (Details)
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100620 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 2)
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100630 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Amortized Cost Basis of Loans by Credit Quality Indicator (Details)
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100640 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of LHFI by Loan Type and Credit Quality Indicator (Details)
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100650 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Trustmark's Portfolio Segments, Loan Classes, Loan Pools and the ACL Methodology and Loss Drivers (Details)
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100660 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Balance in Allowance for Loan Losses (Details)
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100670 - Disclosure - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Change in Allowance for Loan Losses (Details)
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100680 - Disclosure - Acquired Loans - Additional Information (Details)
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100690 - Disclosure - Acquired Loans - Schedule of Acquired Loans (Details)
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100700 - Disclosure - Acquired Loans - Changes in the Carrying Value of Acquired Loans (Details)
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100710 - Disclosure - Acquired Loans - Changes in Accretable Yield of Acquired Loans (Details)
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100720 - Disclosure - Acquired Loans - Components of the Allowance for Loan Losses on Acquired Loans (Details)
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100730 - Disclosure - Acquired Loans - Acquired Loans by Loan Class and Credit Quality Indicator (Details)
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100740 - Disclosure - Acquired Loans - Aging Analysis of Past Due and Nonaccrual Acquired Loans (Details)
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100750 - Disclosure - Mortgage Banking - Schedule of Activity in the Mortgage Servicing Rights (Details)
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100770 - Disclosure - Mortgage Banking - Schedule of Mortgage Loans Sold and Serviced for Others (Details)
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100780 - Disclosure - Other Real Estate - Changes and Gains (Losses), Net on Other Real Estate (Details)
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100790 - Disclosure - Other Real Estate - Other Real Estate, By Type of Property (Details)
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100820 - Disclosure - Leases - Components of Net Lease Cost (Details)
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100830 - Disclosure - Leases - Cash Payments Included in Measurement of Lease Liabilities (Details)
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100840 - Disclosure - Leases - Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases (Details)
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100850 - Disclosure - Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details)
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100860 - Disclosure - Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details)2
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100870 - Disclosure - Deposits - Deposits Summary (Details)
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100880 - Disclosure - Securities Sold Under Repurchase Agreement - Additional Information (Details)
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100890 - Disclosure - Securities Sold Under Repurchase Agreements - Schedule of Securities Sold Under Repurchase Agreements (Details)
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100900 - Disclosure - Revenue from Contracts with Customers - Additional Information (Details)
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100910 - Disclosure - Revenue from Contracts with Customers - Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream (Details)
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100920 - Disclosure - Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost for Plan and Continuing plan (Details)
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100930 - Disclosure - Defined Benefit and Other Postretirement Benefits - Additional Information (Details)
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100940 - Disclosure - Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost (Details)
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101170 - Disclosure - Derivative Financial Instruments - Information about Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheets (Details)
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