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Long-term Debt LT Debt Interest Rates (Details) - USD ($)
$ in Thousands
Sep. 29, 2021
Sep. 19, 2016
Oct. 10, 2007
Aug. 10, 2007
Aug. 08, 2007
Sep. 04, 2003
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Other long-term debt [1]             $ 60,248 $ 60,246
5.50% Subordinated Notes                
Debt Instrument [Line Items]                
Amount issued   $ 100,000            
Stated interest rate   5.50%            
Southside Statutory Trust III                
Debt Instrument [Line Items]                
Amount issued           $ 20,619    
Other long-term debt [1],[2]             20,556 20,554
Southside Statutory Trust III | Three-Month London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis on variable rate           2.94%    
Southside Statutory Trust IV                
Debt Instrument [Line Items]                
Other long-term debt         $ 23,196   23,196 [1] 23,196 [1]
Southside Statutory Trust IV | Three-Month London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis on variable rate         1.30%      
Southside Statutory Trust V                
Debt Instrument [Line Items]                
Other long-term debt       $ 12,887     12,887 [1] 12,887 [1]
Southside Statutory Trust V | Three-Month London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis on variable rate       2.25%        
Magnolia Trust Company I                
Debt Instrument [Line Items]                
Other long-term debt     $ 3,609       $ 3,609 [1] $ 3,609 [1]
Magnolia Trust Company I | Three-Month London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis on variable rate     1.80%          
Scenario, Forecast | 5.50% Subordinated Notes | Three-Month London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis on variable rate 4.297%              
[1]
This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.
[2]
The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $63,000 at June 30, 2019 and $65,000 at December 31, 2018.