Regulatory Matters - Capital and Risk-based Capital and Leverage Ratios (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 108,450
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,481,197	$ 1,422,077
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.0936	0.0915
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,372,747	$ 1,314,295
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	10.21%	11.18%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,481,197	$ 1,422,077
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1101	0.1210
Total Capital to Risk-Weighted Assets - Amount	$ 1,968,001	$ 1,897,167
Total Capital to Risk-Weighted Assets - Ratio	0.1463	0.1614
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,630,389	$ 1,580,904
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.1030	0.1018
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,630,389	$ 1,580,904
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	12.10%	13.46%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,630,389	$ 1,580,904
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1210	0.1346
Total Capital to Risk-Weighted Assets - Amount	$ 1,781,312	$ 1,697,163
Total Capital to Risk-Weighted Assets - Ratio	0.1322	0.1444