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EMPLOYEE BENEFITS - Pension Plan Asset Categories (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement Plan        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets $ 76,735 $ 97,439 $ 90,419 $ 93,818
Retirement Plan Acquired        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 3,128 3,871 $ 3,613 $ 4,763
Level 1 | Retirement Plan | Cash        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 605 3,495    
Level 1 | Retirement Plan | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [1] 23,032 27,692    
Level 1 | Retirement Plan | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 3,594 7,556    
Level 1 | Retirement Plan | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [3] 12,447 15,004    
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] 8,161 9,768    
Level 1 | Retirement Plan | International emerging        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 1,841 2,322    
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] 233 262    
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] 1,103 1,351    
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] 135 151    
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] 66 70    
Level 1 | Retirement Plan Acquired | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [4] 547 775    
Level 1 | Retirement Plan Acquired | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 1,027 1,277    
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] 250 247    
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 8,543 9,949    
Level 2 | Retirement Plan | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 1,979 2,254    
Level 2 | Retirement Plan | U.S. government agencies        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 4,380 5,437    
Level 2 | Retirement Plan | Municipal bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 11,774 13,508    
Level 2 | Retirement Plan | U.S. agency mortgage-backed securities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 146 192    
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 | 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 [8] $ 0 $ 0    
[1] For the Retirement Plan, this category is comprised of broadly diversified “passive” and “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds and domestic stocks.
[2] For the Retirement Plan, this category is comprised of broadly diversified “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds.
[3] For the Retirement Plan, this category is 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.
[4] This category is comprised of pooled separate accounts invested in mutual funds and international stocks.
[5] For the Retirement Plan, this category is comprised of individual investment grade securities that are generally HTM. 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 is 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 individual securities that are generally not HTM.