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Employee Benefit and Deferred Compensation Plans - Additional Information (Details) | 12 Months Ended |
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Dec. 31, 2022 USD ($) plan point shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2007 officer | Dec. 31, 2019 shares
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Accumulated benefit obligation | $ 21,230,000 | $ 27,567,000 |  |  |
Retiring age limit, minimum | 55 years |  |  |  |
Retiring age limit, maximum | 65 years |  |  |  |
Eligible employee from service (in years) | 15 years |  |  |  |
Number of points for eligibility (points) | point | 70 |  |  |  |
Minimum eligible age for Medicare coverage | 65 years |  |  |  |
Health care cost trend rate (percent) | 7.50% |  |  |  |
Redemption notice | 60 days |  |  |  |
Employee deferrals (percent) | 4.00% |  |  |  |
Percentage of plan compensation as nondiscretionary contribution | 5.00% |  |  |  |
Percentage of plan compensation in excess of social security wage base | 5.00% |  |  |  |
Hours of service credited to the employees during the year | 1000 hours |  |  |  |
Profit-sharing contribution | $ 0 |  |  |  |
Employee deferrals amounts | $ 7,045,000 | 11,919,000 | $ 17,888,000 |  |
Number of conventional deferred compensation plans | plan | 2 |  |  |  |
Company's deferred compensation plan expense | $ 1,486,000 | 3,274,000 | 3,965,000 |  |
Number of officers provided for | officer |  |  |  | 4 |
Expiration period subsequent to retirement |  |  |  | 15 years |
Supplemental executive retirement liabilities totaled | 3,523,000 | 3,679,000 |  |  |
Incentive compensation plan expense | $ 9,545,000 | $ 8,609,000 | $ 6,425,000 |  |
Option expiration period | 10 years |  |  |  |
Granted (shares) | shares | 0 | 0 | 0 |  |
Options outstanding (shares) | shares |  | 0 | 10,500 |  | 29,250
Intrinsic value of options exercised |  | $ 262,000 | $ 279,000 |  |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 2,543,213 |  |  |  |
401(k) Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 982,176 |  |  |  |
Deferred Stock Unit Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 145,273 |  |  |  |
2020 Long-Term Incentive Compensation Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Common shares reserved for issuance under employee benefit plans (shares) | shares | 1,073,186 |  |  |  |
Stock Compensation Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Compensation expense | $ 0 | 0 | 0 |  |
Performance- Based Restricted Stock |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Compensation expense | 11,244,000 | 9,882,000 | 10,419,000 |  |
Restricted Stock |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense | $ 12,990,000 |  |  |  |
Weighted average period over which unrecognized expense is expected to be recognized (in years) | 1 year 11 months 19 days |  |  |  |
Growth Investment |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Equity income strategy (percent) | 57.00% |  |  |  |
Growth Investment | Real Estate |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Equity income strategy (percent) | 8.00% |  |  |  |
Growth Investment | Interest rate contracts |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Equity income strategy (percent) | 43.00% |  |  |  |
Pension Benefits Renasant |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Company contribution to pension benefit plan | $ 0 | 0 |  |  |
Accumulated benefit obligation | 21,230,000 | 27,567,000 | $ 28,226,000 |  |
Other Postretirement Benefits Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Company contribution to pension benefit plan | 3,000 | $ 231,000 |  |  |
Expected company contributions | $ 163,000 |  |  |  |

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