Regulatory Matters - Capital and Risk-Based Capital and Leverage Ratios (Details) $ in Thousands	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Renasant corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,455,752	$ 1,422,077
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.0916	0.0915
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,347,681	$ 1,314,295
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	10.74%	11.18%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,455,752	$ 1,422,077
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1160	0.1210
Total Capital to Risk-Weighted Assets - Amount	$ 1,925,190	$ 1,897,167
Total Capital to Risk-Weighted Assets - Ratio	0.1534	0.1614
Renasant bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 1,609,983	$ 1,580,904
Tier 1 Capital to Average Assets (Leverage) - Ratio	0.1013	0.1018
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,609,983	$ 1,580,904
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	12.81%	13.46%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 1,609,983	$ 1,580,904
Tier 1 Capital to Risk-Weighted Assets - Ratio	0.1281	0.1346
Total Capital to Risk-Weighted Assets - Amount	$ 1,743,970	$ 1,697,163
Total Capital to Risk-Weighted Assets - Ratio	0.1387	0.1444