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LONG-TERM DEBT - Other Long-term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 10, 2007
[6]
Aug. 10, 2007
Aug. 08, 2007
Sep. 04, 2003
Debt Instruments [Abstract]            
Subordinated notes, net of unamortized debt issuance costs [1] $ 197,251 $ 98,576        
Trust preferred subordinated debentures [2] 60,255 60,250        
Total long-term obligations 257,506 158,826        
3.875% Subordinated Notes            
Debt Instruments [Abstract]            
Subordinated notes, net of unamortized debt issuance costs [1],[3] 98,497 0        
Unamortized debt issuance expense $ 1,500          
Stated interest rate 3.875%          
5.50% Subordinated Notes            
Debt Instruments [Abstract]            
Subordinated notes, net of unamortized debt issuance costs [1],[4] $ 98,754 98,576        
Unamortized debt issuance expense $ 1,200 1,400        
Stated interest rate 5.50%          
Southside Statutory Trust III, net of unamortized debt issuance costs            
Debt Instruments [Abstract]            
Trust preferred subordinated debentures $ 20,563 [2],[5] 20,558 [2],[5]       $ 20,619
Unamortized debt issuance expense 56 61        
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] $ 3,609      
Minimum | 5.50% 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 discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.5 million at December 31, 2020.
[4] The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.2 million at December 31, 2020 and $1.4 million at December 31, 2019.
[5] The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $56,000 at December 31, 2020 and $61,000 at December 31, 2019.
[6] 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.