Regulatory Matters - Capital and Risk-based Capital and Leverage Ratios (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 110,325
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,935,522	$ 1,578,918
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.1134	0.0962
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,825,197	$ 1,469,531
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	12.73%	10.52%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,935,522	$ 1,578,918
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1350	0.1130
Total Capital to Risk-Weighted Assets - Amount	$ 2,449,129	$ 2,085,531
Total Capital to Risk-Weighted Assets - Ratio	0.1708	0.1493
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,843,123	$ 1,714,965
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.1080	0.1045
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,843,123	$ 1,714,965
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	12.85%	12.25%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,843,123	$ 1,714,965
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1285	0.1225
Total Capital to Risk-Weighted Assets - Amount	$ 2,022,737	$ 1,888,104
Total Capital to Risk-Weighted Assets - Ratio	0.1410	0.1349