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LONG-TERM DEBT - Other Long-term Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Nov. 06, 2020
Oct. 10, 2007
Aug. 10, 2007
Aug. 08, 2007
May 20, 2005
 [4]
Sep. 04, 2003
Debt Instruments [Abstract]                
Subordinated notes, net of unamortized debt issuance costs [1] $ 92,042 $ 93,877            
Trust preferred subordinated debentures [2] 60,274 60,270            
Total long-term obligations 152,316 154,147            
Southside Statutory Trust III, net of unamortized debt issuance costs                
Debt Instruments [Abstract]                
Trust preferred subordinated debentures 20,582 [2],[3] 20,578 [2],[3]           $ 20,619
Unamortized debt issuance expense 37 41            
Southside Statutory Trust IV                
Debt Instruments [Abstract]                
Trust preferred subordinated debentures 23,196 [2] 23,196 [2]       $ 23,196    
Southside Statutory Trust V                
Debt Instruments [Abstract]                
Trust preferred subordinated debentures 12,887 [2] 12,887 [2]     $ 12,887      
Magnolia Trust Company I                
Debt Instruments [Abstract]                
Trust preferred subordinated debentures 3,609 [2] 3,609 [2]   $ 3,600     $ 3,609  
3.875% Subordinated Notes                
Debt Instruments [Abstract]                
Subordinated notes, net of unamortized debt issuance costs [1],[5] 92,042 93,877            
Unamortized debt issuance expense $ 958 $ 1,100            
Stated interest rate     3.875%          
Debt face amount [6]     $ 100,000          
Minimum | 3.875% Subordinated Notes                
Debt Instruments [Abstract]                
Long-term debt, remaining maturity, greater than 1 year              
[1] This debt consists of subordinated notes with a remaining maturity greater than one year that qualify under the risk-based capital guidelines as Tier 2 capital, subject to certain limitations.
[2] This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.
[3] The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $37,000 at December 31, 2024 and $41,000 at December 31, 2023.
[4] On October 10, 2007, as part of an acquisition we assumed $3.6 million of floating rate junior subordinated debentures issued in 2005 to Magnolia Trust Company I.
[5] The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $958,000 at December 31, 2024 and $1.1 million at December 31, 2023.
[6] On April 4, 2024 and June 14, 2023, the Company repurchased $2.0 million and $5.0 million, respectively, of the $100.0 million fixed-to-floating rate subordinated notes that mature on November 15, 2030.