Parent Company Only Financial Information - Additional Information (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Condensed Financial Statements Captions [Line Items] | |||
| Income taxes paid | $ 24,809 | $ 12,435 | $ 7,371 |
| Trustmark Corp (Parent Company Only) [Member] | |||
| Condensed Financial Statements Captions [Line Items] | |||
| Income taxes paid | 24,800 | 12,400 | 7,400 |
| Interest paid | $ 283 | ||
| Interest received | $ 482 | $ 320 | |