Regulatory Matters - (Details 1) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 739,605	$ 550,106
Tier 1 capital to average assets (leverage) - ratio (percent)	9.18%	9.89%
Common equity tier 1 capital to risk-weighted assets - amount	$ 648,272	$ 459,108
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	10.13%	10.45%
Tier 1 capital to risk-weighted assets - amount	$ 739,605	$ 550,106
Tier 1 capital to risk-weighted assets - ratio (percent)	11.56%	12.52%
Total capital to risk-weighted assets - amount	$ 788,027	$ 595,089
Total capital to risk-weighted assets - ratio (percent)	12.31%	13.55%
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital to average assets (leverage) - amount	$ 712,637	$ 534,552
Tier 1 capital to average assets (leverage) - ratio (percent)	8.87%	9.63%
Common equity tier 1 capital to risk-weighted assets - amount	$ 712,637	$ 534,552
Common equity tier 1 capital to risk-weighted assets - ratio (percent)	11.17%	12.20%
Tier 1 capital to risk-weighted assets - amount	$ 712,637	$ 534,552
Tier 1 capital to risk-weighted assets - ratio (percent)	11.17%	12.20%
Total capital to risk-weighted assets - amount	$ 761,059	$ 578,960
Total capital to risk-weighted assets - ratio (percent)	11.93%	13.21%