Employee Benefit and Deferred Compensation Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits Renasant
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	738	682	984
Expected return on plan assets	(1,684)	(1,768)	(1,651)
Prior service cost recognized	0	0	0
Recognized actuarial loss (gain)	243	265	349
Settlement/curtailment/termination losses	0	0	567
Net periodic benefit cost	(703)	(821)	249
Net actuarial loss (gain) arising during the period	4,155	577	(1,090)
Net Settlement/curtailment/termination losses	0	0	(567)
New prior service cost	0	0	0
Amortization of net actuarial (loss) gain recognized in net periodic pension cost	(243)	(265)	(349)
Amortization of prior service cost	0	0	0
Total recognized in other comprehensive income	3,912	312	(2,006)
Total recognized in net periodic benefit cost and other comprehensive income	$ 3,209	$ (509)	$ (1,757)
Discount rate used to determine net periodic pension cost	2.79%	2.44%	3.59%
Expected return on plan assets	5.75%	6.00%	6.00%
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4	$ 5	$ 6
Interest cost	12	14	13
Expected return on plan assets	0	0	0
Prior service cost recognized	0	0	485
Recognized actuarial loss (gain)	(76)	(3)	(90)
Settlement/curtailment/termination losses	0	0	0
Net periodic benefit cost	(60)	16	414
Net actuarial loss (gain) arising during the period	(48)	(221)	21
Net Settlement/curtailment/termination losses	0	0	0
New prior service cost	0	0	485
Amortization of net actuarial (loss) gain recognized in net periodic pension cost	76	3	90
Amortization of prior service cost	0	0	(485)
Total recognized in other comprehensive income	28	(218)	111
Total recognized in net periodic benefit cost and other comprehensive income	$ (32)	$ (202)	$ 525
Discount rate used to determine net periodic pension cost	2.35%	1.77%	2.91%