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Regulatory Matters - Capital and Risk-based Capital and Leverage Ratios (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Renasant Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Amount Included in Tier 1 Capital | $ 1,306,597 | $ 1,262,588
Tier 1 Capital to Average Assets (Leverage) (percent) | 0.0937 | 0.1037
Common Equity Tier One Capital to Risk - Weighted Assets, amount | $ 1,199,394 | $ 1,156,828
Common Equity Tier One Capital to Risk - Weighted Assets (percent) | 10.93% | 11.12%
Tier 1 Capital to Risk -Weighted Assets, amount | $ 1,306,597 | $ 1,262,588
Tier 1 Capital to Risk - Weighted Assets (percent) | 0.1191 | 0.1214
Total Capital to Risk - Weighted Assets, amount | $ 1,653,694 | $ 1,432,949
Total Capital to Risk - Weighted Assets (percent) | 0.1507 | 0.1378
Renasant Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Amount Included in Tier 1 Capital | $ 1,369,994 | $ 1,331,809
Tier 1 Capital to Average Assets (Leverage) (percent) | 0.0983 | 0.1095
Common Equity Tier One Capital to Risk - Weighted Assets, amount | $ 1,369,994 | $ 1,331,809
Common Equity Tier One Capital to Risk - Weighted Assets (percent) | 12.49% | 12.81%
Tier 1 Capital to Risk -Weighted Assets, amount | $ 1,369,994 | $ 1,331,809
Tier 1 Capital to Risk - Weighted Assets (percent) | 0.1249 | 0.1281
Total Capital to Risk - Weighted Assets, amount | $ 1,504,985 | $ 1,388,553
Total Capital to Risk - Weighted Assets (percent) | 0.1373 | 0.1336

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