Regulatory Matters - (Details 1) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 688,601	$ 539,523
Tier 1 capital to average assets (leverage) - ratio (percent)	9.19%	9.74%
Common equity tier 1 capital to risk-weighted assets - amount	$ 597,827	$ 448,027
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	9.88%	10.35%
Tier 1 capital to risk-weighted assets - amount	$ 688,601	$ 539,523
Tier 1 capital to risk-weighted assets - ratio (percent)	11.38%	12.47%
Total capital to risk-weighted assets - amount	$ 736,354	$ 584,916
Total capital to risk-weighted assets - ratio (percent)	12.17%	13.51%
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 662,524	$ 523,505
Tier 1 capital to average assets (leverage) - ratio (percent)	8.86%	9.48%
Common equity tier 1 capital to risk-weighted assets - amount	$ 662,524	$ 523,505
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	10.98%	12.13%
Tier 1 capital to risk-weighted assets - amount	$ 662,524	$ 523,505
Tier 1 capital to risk-weighted assets - ratio (percent)	10.98%	12.13%
Total capital to risk-weighted assets - amount	$ 709,708	$ 568,326
Total capital to risk-weighted assets - ratio (percent)	11.76%	13.16%