Regulatory Matters - Capital and Risk-Based Capital and Leverage Ratios (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,621,168	$ 1,578,918
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.0981	0.0962
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,511,312	$ 1,469,531
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	10.75%	10.52%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,621,168	$ 1,578,918
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1153	0.1130
Total Capital to Risk-Weighted Assets - Amount	$ 2,130,901	$ 2,085,531
Total Capital to Risk-Weighted Assets - Ratio	0.1515	0.1493
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,752,876	$ 1,714,965
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.1061	0.1045
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,752,876	$ 1,714,965
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	12.44%	12.25%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,752,876	$ 1,714,965
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1244	0.1225
Total Capital to Risk-Weighted Assets - Amount	$ 1,929,307	$ 1,888,104
Total Capital to Risk-Weighted Assets - Ratio	0.1369	0.1349