Employee Benefit and Deferred Compensation Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits Renasant
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	908	995	738
Expected return on plan assets	(993)	(1,236)	(1,684)
Recognized actuarial loss (gain)	517	523	243
Net periodic benefit cost	432	282	(703)
Net actuarial (gain) loss arising during the period	(455)	(60)	4,155
Amortization of net actuarial (loss) gain recognized in net periodic pension cost	(516)	(523)	(243)
Total recognized in other comprehensive income	(971)	(583)	3,912
Total recognized in net periodic benefit cost and other comprehensive income	$ (539)	$ (301)	$ 3,209
Discount rate used to determine net periodic pension cost	4.74%	4.94%	2.79%
Expected return on plan assets	5.20%	6.25%	5.75%
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 1	$ 4
Interest cost	21	22	12
Expected return on plan assets	0	0	0
Recognized actuarial loss (gain)	(93)	(61)	(76)
Net periodic benefit cost	(72)	(38)	(60)
Net actuarial (gain) loss arising during the period	(89)	(20)	(48)
Amortization of net actuarial (loss) gain recognized in net periodic pension cost	94	61	76
Total recognized in other comprehensive income	5	41	28
Total recognized in net periodic benefit cost and other comprehensive income	$ (67)	$ 3	$ (32)
Discount rate used to determine net periodic pension cost	4.53%	4.74%	2.35%