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Cover
 12 Months Ended
Dec. 31, 2024
Document Information [Line Items]  
Document Type DEFR14A
Amendment Flag true
Amendment Description On April 2, 2025, an incorrect version of the definitive proxy statement of Simmons First National Corporation (the “Company”) was filed by the Company’s financial printer in error. Accordingly, the Company is filing this Amendment No. 1 to Schedule 14A to replace, in its entirety, the definitive proxy statement that initially was filed. This Amendment No. 1 includes, in its entirety, the Company’s Notice of Annual Meeting of Shareholders, Proxy Statement and form of proxy card being mailed to the Company’s shareholders in connection with the Company’s 2025 Annual Meeting of Shareholders.
Entity Information [Line Items]  
Entity Registrant Name SIMMONS FIRST NATIONAL CORPORATION
Entity Central Index Key 0000090498