Regulatory Matters (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Renasant Corporation
Capital and risk-based capital and leverage ratios for the Company and for Renasant Bank
Amount Included in Tier 1 Capital	$ 979,604	$ 858,850
Tier 1 Capital to Average Assets (Leverage) (percent)	10.18%	10.59%
Common Equity Tier One Capital to Risk - Weighted Assets, amount	$ 896,733	$ 766,560
Common Equity Tier One Capital to Risk - Weighted Assets (percent)	11.34%	11.47%
Tier 1 Capital to Risk -Weighted Assets, amount	$ 979,604	$ 858,850
Tier 1 Capital to Risk - Weighted Assets (percent)	12.39%	12.86%
Total Capital to Risk - Weighted Assets, amount	$ 1,142,926	$ 1,004,038
Total Capital to Risk - Weighted Assets (percent)	14.46%	15.03%
Renasant Bank
Capital and risk-based capital and leverage ratios for the Company and for Renasant Bank
Amount Included in Tier 1 Capital	$ 1,000,715	$ 824,850
Tier 1 Capital to Average Assets (Leverage) (percent)	10.42%	10.20%
Common Equity Tier One Capital to Risk - Weighted Assets, amount	$ 1,000,715	$ 824,850
Common Equity Tier One Capital to Risk - Weighted Assets (percent)	12.69%	12.38%
Tier 1 Capital to Risk -Weighted Assets, amount	$ 1,000,715	$ 824,850
Tier 1 Capital to Risk - Weighted Assets (percent)	12.69%	12.38%
Total Capital to Risk - Weighted Assets, amount	$ 1,050,751	$ 871,911
Total Capital to Risk - Weighted Assets (percent)	13.32%	13.09%