Employee Benefit and Deferred Compensation Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits Renasant
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	995	738	682
Expected return on plan assets	(1,236)	(1,684)	(1,768)
Recognized actuarial loss (gain)	523	243	265
Net periodic benefit cost	282	(703)	(821)
Net actuarial (gain) loss arising during the period	(60)	4,155	577
Amortization of net actuarial (loss) gain recognized in net periodic pension cost	(523)	(243)	(265)
Total recognized in other comprehensive income	(583)	3,912	312
Total recognized in net periodic benefit cost and other comprehensive income	$ (301)	$ 3,209	$ (509)
Discount rate used to determine net periodic pension cost	4.94%	2.79%	2.44%
Expected return on plan assets	6.25%	5.75%	6.00%
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1	$ 4	$ 5
Interest cost	22	12	14
Expected return on plan assets	0	0	0
Recognized actuarial loss (gain)	(61)	(76)	(3)
Net periodic benefit cost	(38)	(60)	16
Net actuarial (gain) loss arising during the period	(20)	(48)	(221)
Amortization of net actuarial (loss) gain recognized in net periodic pension cost	61	76	3
Total recognized in other comprehensive income	41	28	(218)
Total recognized in net periodic benefit cost and other comprehensive income	$ 3	$ (32)	$ (202)
Discount rate used to determine net periodic pension cost	4.74%	2.35%	1.77%