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DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Feb. 22, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity File Number 000-12247    
Entity Registrant Name SOUTHSIDE BANCSHARES, INC.    
Entity Incorporation, State or Country Code TX    
Entity Central Index Key 0000705432    
Entity Tax Identification Number 75-1848732    
Entity Address, Address Line One 1201 S. Beckham Avenue,    
Entity Address, City or Town Tyler,    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75701    
City Area Code 903    
Local Phone Number 531-7111    
Title of 12(b) Security Common Stock, $1.25 par value    
Trading Symbol SBSI    
Security Exchange Name NASDAQ    
Amendment Flag false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,130.0
Entity Common Stock Shares Outstanding (in shares)   31,393,360  
Documents Incorporated by Reference Certain portions of the Registrant’s Proxy statement to be filed for the Annual Meeting of Shareholders to be held May 17, 2023 are incorporated by reference into Part III of this Annual Report on Form 10-K.  Other than those portions of the proxy statement specifically incorporated by reference pursuant to Items 10-14 of Part III hereof, no other portions of the proxy statement shall be deemed so incorporated.