Employee Benefit and Deferred Compensation Plans - Additional Information (Details)	12 Months Ended
	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