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Regulatory Matters - Capital and Risk-Based Capital and Leverage Ratios (Details) - USD ($)
$ in Thousands
Sep. 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 $ 970,005 $ 858,850
Tier 1 capital to average assets (leverage) - ratio 10.05% 10.59%
Common equity tier 1 capital to risk-weighted assets - amount $ 887,234 $ 766,560
Common equity tier 1 capital to risk-weighted assets - ratio 11.21% 11.47%
Tier 1 capital to risk-weighted assets - amount $ 970,005 $ 858,850
Tier 1 capital to risk-weighted assets - ratio 12.26% 12.86%
Total capital to risk-weighted assets - amount $ 1,131,605 $ 1,004,038
Total capital to risk-weighted assets - ratio 14.30% 15.03%
Renasant Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 capital to average assets (leverage) - amount $ 990,117 $ 824,850
Tier 1 capital to average assets (leverage) - ratio 10.28% 10.20%
Common equity tier 1 capital to risk-weighted assets - amount $ 990,117 $ 824,850
Common equity tier 1 capital to risk-weighted assets - ratio 12.54% 12.38%
Tier 1 capital to risk-weighted assets - amount $ 990,117 $ 824,850
Tier 1 capital to risk-weighted assets - ratio 12.54% 12.38%
Total capital to risk-weighted assets - amount $ 1,038,473 $ 871,911
Total capital to risk-weighted assets - ratio 13.15% 13.09%