Fair Value Measurements (Details) - 401 (k) Plan - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Common stock, par value (in dollars per share)	$ 5.00
Total investments	$ 381,607	$ 315,498
Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	287,126	222,395
Separately managed accounts
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	70,591	70,656
Renasant Corporation common stock
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	23,890	22,447
Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	381,607	315,498
Level 1 \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	287,126	222,395
Level 1 \| Separately managed accounts
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	70,591	70,656
Level 1 \| Renasant Corporation common stock
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	$ 23,890	$ 22,447

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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