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Employee Benefit and Deferred Compensation Plans - Categorization of Plan Assets (Details) - Pension Benefits Renasant - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 19,148 | $ 20,119 | $ 20,854
Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 281 | 1,042 |
Investments in collective trusts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 16,590 | 17,830 |
U.S. government securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 156 | 47 |
Corporate stocks |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 2,121 | 1,200 |
Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 2,402 | 2,242 |
Quoted Prices In Active Markets for Identical Assets (Level 1) | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 281 | 1,042 |
Quoted Prices In Active Markets for Identical Assets (Level 1) | Investments in collective trusts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. government securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices In Active Markets for Identical Assets (Level 1) | Corporate stocks |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 2,121 | 1,200 |
Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 156 | 47 |
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Investments in collective trusts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Other Observable Inputs (Level 2) | U.S. government securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 156 | 47 |
Significant Other Observable Inputs (Level 2) | Corporate stocks |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Investments in collective trusts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | U.S. government securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Corporate stocks |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Measured at net asset value per share (“NAV”) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 16,590 | 17,830 |
Measured at net asset value per share (“NAV”) | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Measured at net asset value per share (“NAV”) | Investments in collective trusts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 16,590 | 17,830 |
Measured at net asset value per share (“NAV”) | U.S. government securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Measured at net asset value per share (“NAV”) | Corporate stocks |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 0 | $ 0 |

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