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Long-term Debt Long-term Obligations
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Long-term Obligations Long-term Debt    
 
September 30,
2019
 
December 31,
2018
 
(in thousands)
Subordinated notes: (1)
 
 
 
5.50% Subordinated Notes, net of unamortized debt issuance costs (2)
$
98,532

 
$
98,407

Total Subordinated notes
98,532

 
98,407

Trust preferred subordinated debentures: (3)
 
 
 
Southside Statutory Trust III, net of unamortized debt issuance costs (4)
20,557

 
20,554

Southside Statutory Trust IV
23,196

 
23,196

Southside Statutory Trust V
12,887

 
12,887

Magnolia Trust Company I
3,609

 
3,609

Total Trust preferred subordinated debentures
60,249

 
60,246

Total Long-term debt
$
158,781

 
$
158,653


(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 $1.5 million at September 30, 2019 and $1.6 million at December 31, 2018.
(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 $62,000 at September 30, 2019 and $65,000 at December 31, 2018.

As of September 30, 2019, the details of the subordinated notes and the trust preferred subordinated debentures are summarized below (dollars in thousands):
 
Date Issued
 
Amount Issued
 
Fixed or Floating Rate
 
Interest Rate
 
Maturity Date
5.50% Subordinated Notes
September 19, 2016
 
$
100,000

 
Fixed-to-Floating
 
5.50%
 
September 30, 2026
Southside Statutory Trust III
September 4, 2003
 
$
20,619

 
Floating
 
3 month LIBOR + 2.94%
 
September 4, 2033
Southside Statutory Trust IV
August 8, 2007
 
$
23,196

 
Floating
 
3 month LIBOR + 1.30%
 
October 30, 2037
Southside Statutory Trust V
August 10, 2007
 
$
12,887

 
Floating
 
3 month LIBOR + 2.25%
 
September 15, 2037
Magnolia Trust Company I (1)
October 10, 2007
 
$
3,609

 
Floating
 
3 month LIBOR + 1.80%
 
November 23, 2035
(1)
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 September 19, 2016, the Company issued $100.0 million aggregate principal amount of fixed-to-floating rate subordinated notes that mature on September 30, 2026. This debt initially bears interest at a fixed rate of 5.50% through September 29, 2021 and thereafter, adjusts quarterly at a floating rate equal to three-month LIBOR plus 429.7 basis points. The proceeds from the sale of the subordinated notes were used for general corporate purposes, which included advances to the Bank to finance its activities.