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LONG-TERM DEBT - Other Long-term Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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] $ 93,877 $ 98,674            
Trust preferred subordinated debentures [2] 60,270 60,265            
Total long-term obligations 154,147 158,939            
Southside Statutory Trust III, net of unamortized debt issuance costs                
Debt Instruments [Abstract]                
Trust preferred subordinated debentures 20,578 [2],[3] 20,573 [2],[3]           $ 20,619
Unamortized debt issuance expense 41 46            
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] 93,877 98,674            
Unamortized debt issuance expense $ 1,100 $ 1,300            
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 $41,000 at December 31, 2023 and $46,000 at December 31, 2022.
[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 $1.1 million at December 31, 2023 and $1.3 million at December 31, 2022.
[6] On June 14, 2023, the Company repurchased $5.0 million of the $100.0 million fixed-to-floating rate subordinated notes that mature on November 15, 2030.