XML 61 R52.htm IDEA: XBRL DOCUMENT v3.23.1
Long-term Debt LT Debt Interest Rates (Details) - USD ($)
$ in Thousands
Nov. 14, 2025
Aug. 10, 2007
Aug. 08, 2007
May 20, 2005
Sep. 04, 2003
Mar. 31, 2023
Dec. 31, 2022
Nov. 06, 2020
Oct. 10, 2007
Debt Instrument [Line Items]                  
Other long-term debt [1]           $ 60,266 $ 60,265    
Southside Statutory Trust III                  
Debt Instrument [Line Items]                  
Other long-term debt         $ 20,619 20,574 [1],[2] 20,573 [1],[2]    
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]   $ 3,609 [1] $ 3,609 [1]   $ 3,600
Magnolia Trust Company I | Three-Month London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Basis on variable rate       1.80%          
3.875% Subordinated Notes                  
Debt Instrument [Line Items]                  
Debt face amount               $ 100,000  
Stated interest rate           3.875%   3.875%  
Forecast | 3.875% Subordinated Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                  
Debt Instrument [Line Items]                  
Basis on variable rate 3.66%                
[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 $45,000 at March 31, 2023 and $46,000 at December 31, 2022.
[3] 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.