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Long-term Debt (Tables)
 3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Information related to our long-term debt is summarized as follows for the periods presented (in thousands):    
March 31, 2024December 31, 2023
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)
$93,913 $93,877 
Total Subordinated notes93,913 93,877 
Trust preferred subordinated debentures: (3)
Southside Statutory Trust III, net of unamortized debt issuance costs (4)
20,579 20,578 
Southside Statutory Trust IV23,196 23,196 
Southside Statutory Trust V12,887 12,887 
Magnolia Trust Company I3,609 3,609 
Total Trust preferred subordinated debentures60,271 60,270 
Total Long-term debt$154,184 $154,147 

(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)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $1.1 million at March 31, 2024 and December 31, 2023.
(3)This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.
(4)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $40,000 at March 31, 2024 and $41,000 at December 31, 2023.
Schedule of Subordinated Borrowing
As of March 31, 2024, the details of the subordinated notes and the trust preferred subordinated debentures are summarized below (dollars in thousands):
Date IssuedAmount IssuedFixed or Floating RateInterest RateMaturity Date
3.875% Subordinated Notes (1)
November 6, 2020$100,000 Fixed-to-Floating3.875%November 15, 2030
Southside Statutory Trust IIISeptember 4, 2003$20,619 Floating
3 month SOFR + 3.20%
September 4, 2033
Southside Statutory Trust IVAugust 8, 2007$23,196 Floating
3 month SOFR + 1.56%
October 30, 2037
Southside Statutory Trust VAugust 10, 2007$12,887 Floating
3 month SOFR + 2.51%
September 15, 2037
Magnolia Trust Company I (2)
May 20, 2005$3,609 Floating
3 month SOFR + 2.06%
November 23, 2035
(1)On June 14, 2023, the Company repurchased $5.0 million of the $100 million fixed-to-floating rate subordinated notes that mature on November 15, 2030.
(2)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.