Regulatory Matters - (Details 1) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 860,684	$ 858,850
Tier 1 capital to average assets (leverage) - ratio (percent)	10.39%	10.59%
Common equity tier 1 capital to risk-weighted assets - amount	$ 778,273	$ 766,560
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	11.69%	11.47%
Tier 1 capital to risk-weighted assets - amount	$ 860,684	$ 858,850
Tier 1 capital to risk-weighted assets - ratio (percent)	12.93%	12.86%
Total capital to risk-weighted assets - amount	$ 1,006,093	$ 1,004,038
Total capital to risk-weighted assets - ratio (percent)	15.11%	15.03%
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 864,457	$ 824,850
Tier 1 capital to average assets (leverage) - ratio (percent)	10.46%	10.20%
Common equity tier 1 capital to risk-weighted assets - amount	$ 864,457	$ 824,850
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	13.00%	12.38%
Tier 1 capital to risk-weighted assets - amount	$ 864,457	$ 824,850
Tier 1 capital to risk-weighted assets - ratio (percent)	13.00%	12.38%
Total capital to risk-weighted assets - amount	$ 911,704	$ 871,911
Total capital to risk-weighted assets - ratio (percent)	13.71%	13.09%