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Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost for Plan and Spin-Off plan (Details) - Trustmark Capital Accumulation Plan [Member] - Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net periodic benefit cost [Abstract]    
Service cost $ 63 $ 108
Interest cost 665 830
Expected return on plan assets (108) (1,022)
Recognized net loss due to lump sum settlements 0 423
Recognized net actuarial loss 565 661
Net periodic benefit cost $ 1,185 $ 1,000