Regulatory Matters - (Details 1) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 880,239	$ 858,850
Tier 1 capital to average assets (leverage) - ratio (percent)	10.68%	10.59%
Common equity tier 1 capital to risk-weighted assets - amount	$ 797,620	$ 766,560
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	11.65%	11.47%
Tier 1 capital to risk-weighted assets - amount	$ 880,239	$ 858,850
Tier 1 capital to risk-weighted assets - ratio (percent)	12.86%	12.86%
Total capital to risk-weighted assets - amount	$ 1,026,916	$ 1,004,038
Total capital to risk-weighted assets - ratio (percent)	15.00%	15.03%
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 884,090	$ 824,850
Tier 1 capital to average assets (leverage) - ratio (percent)	10.75%	10.20%
Common equity tier 1 capital to risk-weighted assets - amount	$ 884,090	$ 824,850
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	12.93%	12.38%
Tier 1 capital to risk-weighted assets - amount	$ 884,090	$ 824,850
Tier 1 capital to risk-weighted assets - ratio (percent)	12.93%	12.38%
Total capital to risk-weighted assets - amount	$ 932,564	$ 871,911
Total capital to risk-weighted assets - ratio (percent)	13.64%	13.09%