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EMPLOYEE BENEFITS - Pension Plan Asset Categories (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Retirement Plan        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets $ 77,488 $ 81,551 $ 76,735 $ 97,439
Retirement Plan Acquired        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 3,152 3,085 $ 3,128 $ 3,871
Level 1 | Retirement Plan | Cash        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 0 1,428    
Level 1 | Retirement Plan | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [1] 0 28,506    
Level 1 | Retirement Plan | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 0 4,323    
Level 1 | Retirement Plan | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [3] 0 11,907    
Level 1 | Retirement Plan | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [4] 0 0    
Level 1 | Retirement Plan | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 0    
Level 1 | Retirement Plan | International developed        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [6] 0 9,317    
Level 1 | Retirement Plan | International emerging        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 0 1,964    
Level 1 | Retirement Plan | Real estate        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [7] 0 0    
Level 1 | Retirement Plan | US Treasury and Government        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 148    
Level 1 | Retirement Plan Acquired | Cash        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 0 0    
Level 1 | Retirement Plan Acquired | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [1] 706 1,055    
Level 1 | Retirement Plan Acquired | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 37 125    
Level 1 | Retirement Plan Acquired | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [3] 13 64    
Level 1 | Retirement Plan Acquired | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [4] 295 540    
Level 1 | Retirement Plan Acquired | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 2,030 1,078    
Level 1 | Retirement Plan Acquired | International developed        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [6] 0 0    
Level 1 | Retirement Plan Acquired | International emerging        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 0 0    
Level 1 | Retirement Plan Acquired | Real estate        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [7] 71 223    
Level 1 | Retirement Plan Acquired | US Treasury and Government        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 0    
Level 2 | Retirement Plan | Cash equivalents        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 1,598 5,957    
Level 2 | Retirement Plan | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 4,010 0    
Level 2 | Retirement Plan | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 977 0    
Level 2 | Retirement Plan | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 557 0    
Level 2 | Retirement Plan | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 1,532 0    
Level 2 | Retirement Plan | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 1,893    
Level 2 | Retirement Plan | U.S. government agencies        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 4,871    
Level 2 | Retirement Plan | Municipal bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 11,119    
Level 2 | Retirement Plan | U.S. agency mortgage-backed securities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [9] 0 118    
Level 2 | Retirement Plan | Collective investment funds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [10] 68,814 0    
Level 2 | Retirement Plan Acquired | Cash equivalents        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 0 0    
Level 2 | Retirement Plan Acquired | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 0 0    
Level 2 | Retirement Plan Acquired | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 0 0    
Level 2 | Retirement Plan Acquired | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 0 0    
Level 2 | Retirement Plan Acquired | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 0 0    
Level 2 | Retirement Plan Acquired | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 0    
Level 2 | Retirement Plan Acquired | U.S. government agencies        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 0    
Level 2 | Retirement Plan Acquired | Municipal bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 0    
Level 2 | Retirement Plan Acquired | U.S. agency mortgage-backed securities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [9] 0 0    
Level 2 | Retirement Plan Acquired | Collective investment funds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [10] $ 0 $ 0    
[1] For the Retirement Plan, this category was comprised of broadly diversified “passive” and “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested mainly in domestic stocks.
[2] For the Retirement Plan, this category was comprised of broadly diversified “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested mainly in mutual funds and domestic stocks.
[3] For the Retirement Plan, this category was comprised of broadly diversified “passive” and “active” mutual funds and shares of Southside Bancshares stock. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds and domestic stocks.
[4] This category is comprised of pooled separate accounts invested in mutual funds and international stocks.
[5] For the Retirement Plan, this category was comprised of individual investment grade securities that are generally HTM, as well as broadly diversified “active” mutual funds bonds and fixed income securities. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds, bonds and fixed income securities.
[6] This category was comprised of a broadly diversified “passive” and “active” mutual funds.
[7] This category is comprised of a pooled separate account invested in commercial real estate and includes mortgage loans which are backed by the associated properties.
[8] This category is comprised of collective investment funds invested in mutual funds
[9] This category was comprised of individual securities that are generally not HTM.
[10] Funds invest principally in investment grade debt securities, including U.S. Government obligations, corporate bonds and mortgage and asset backed securities.