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LONG-TERM OBLIGATIONS - Other Long-term Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 10, 2007
[5]
Debt Instruments [Abstract]      
Subordinated notes, net of unamortized debt issuance costs [1] $ 98,248 $ 98,100  
Trust preferred subordinated debentures [2] 60,241 60,236  
Total long-term obligations 158,489 158,336  
5.50% Subordinated Notes      
Debt Instruments [Abstract]      
Subordinated notes, net of unamortized debt issuance costs [1],[3] 98,248 98,100  
Unamortized debt issuance expense 1,800 1,900  
Southside Statutory Trust III, net of unamortized debt issuance costs      
Debt Instruments [Abstract]      
Trust preferred subordinated debentures [2],[4] 20,549 20,544  
Unamortized debt issuance expense 70 75  
Southside Statutory Trust IV      
Debt Instruments [Abstract]      
Trust preferred subordinated debentures 23,196 23,196 [2]  
Southside Statutory Trust V      
Debt Instruments [Abstract]      
Trust preferred subordinated debentures 12,887 12,887 [2]  
Magnolia Trust Company I      
Debt Instruments [Abstract]      
Trust preferred subordinated debentures $ 3,609 [5] $ 3,609 [2] $ 3,600
Minimum | 5.50% Subordinated Notes      
Debt Instruments [Abstract]      
Long-term debt, remaining maturity 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 $1.8 million at December 31, 2017 and $1.9 million at December 31, 2016.
[4] The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $70,000 at December 31, 2017 and $75,000 at December 31, 2016.
[5] 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.