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Long-term Debt
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Long-term Debt Long-term Debt
Information related to our long-term debt is summarized as follows for the periods presented (in thousands):    
September 30, 2025December 31, 2024
Subordinated notes: (1)
3.875% Subordinated notes, net of unamortized debt issuance costs (2)
$92,152 $92,042 
7.00% Subordinated notes, net of unamortized debt issuance costs (3)
147,449 — 
Total Subordinated notes239,601 92,042 
Trust preferred subordinated debentures: (4)
Southside Statutory Trust III, net of unamortized debt issuance costs (5)
20,586 20,582 
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 debentures60,278 60,274 
Total Long-term debt$299,879 $152,316 

(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 $848,000 at September 30, 2025 and $958,000 at December 31, 2024.
(3)The unamortized discount and debt issuance costs reflected in the carrying amount of the subordinated notes totaled approximately $2.6 million at September 30, 2025.
(4)This debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.
(5)The unamortized debt issuance costs reflected in the carrying amount of the Southside Statutory Trust III junior subordinated debentures totaled $33,000 at September 30, 2025 and $37,000 at December 31, 2024.

As of September 30, 2025, 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
7.00% Subordinated Notes
August 14, 2025$150,000 Fixed-to-Floating7.00%August 15, 2035
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 April 4, 2024 and June 14, 2023, the Company repurchased $2.0 million and $5.0 million, respectively, 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.

On November 6, 2020, the Company issued $100.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes that mature on November 15, 2030. This debt initially bears interest at a fixed rate of 3.875% per year through November 14, 2025 and thereafter, adjusts quarterly at a floating rate equal to the then current three-month term SOFR, as published by the FRBNY, plus 366 basis points. The proceeds from the sale of the subordinated notes were used for general corporate purposes.

On August 14, 2025, the Company issued $150.0 million in aggregate principal amount of fixed-to-floating rate subordinated notes that mature on August 15, 2035. This debt initially bears interest at a fixed rate of 7.00% per year through August 15, 2030 and thereafter, adjusts quarterly at a floating rate equal to the then current three-month term SOFR, as published by the FRBNY, plus 357 basis points. The proceeds from the sale of the subordinated notes were used for general corporate purposes.