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EMPLOYEE BENEFITS - Pension Plan Asset Categories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Pension Plan        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets $ 93,818 $ 84,911 $ 91,233 $ 85,293
Defined Benefit Pension Plan Acquired        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 4,763 4,070 $ 4,031 $ 2,993
Level 1 | Defined Benefit Pension Plan | Cash        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 791 278    
Level 1 | Defined Benefit Pension Plan | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [1] 11,482 5,204    
Level 1 | Defined Benefit Pension Plan | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 11,081 18,913    
Level 1 | Defined Benefit Pension Plan | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [3] 17,846 9,900    
Level 1 | Defined Benefit Pension Plan | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [4] 0 0    
Level 1 | Defined Benefit Pension Plan | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 0    
Level 1 | Defined Benefit Pension Plan | International developed        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [6] 8,771 6,733    
Level 1 | Defined Benefit Pension Plan | International emerging        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 4,383 3,464    
Level 1 | Defined Benefit Pension Plan | Real estate        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [7] 0 0    
Level 1 | Defined Benefit Pension Plan | Balanced asset allocation        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 0 0    
Level 1 | Defined Benefit Pension Plan Acquired | Cash        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 0 0    
Level 1 | Defined Benefit Pension Plan Acquired | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [1] 1,548 0    
Level 1 | Defined Benefit Pension Plan Acquired | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 183 0    
Level 1 | Defined Benefit Pension Plan Acquired | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [3] 87 0    
Level 1 | Defined Benefit Pension Plan Acquired | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [4] 992 0    
Level 1 | Defined Benefit Pension Plan Acquired | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 1,580 0    
Level 1 | Defined Benefit Pension Plan Acquired | International developed        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [6] 0 0    
Level 1 | Defined Benefit Pension Plan Acquired | International emerging        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 0 0    
Level 1 | Defined Benefit Pension Plan Acquired | Real estate        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [7] 278 0    
Level 1 | Defined Benefit Pension Plan Acquired | Balanced asset allocation        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 95 0    
Level 2 | Defined Benefit Pension Plan | Cash equivalents        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 16,007 15,025    
Level 2 | Defined Benefit Pension Plan | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [1] 0 0    
Level 2 | Defined Benefit Pension Plan | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 0 0    
Level 2 | Defined Benefit Pension Plan | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [3] 0 0    
Level 2 | Defined Benefit Pension Plan | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [4] 0 0    
Level 2 | Defined Benefit Pension Plan | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 965 952    
Level 2 | Defined Benefit Pension Plan | U.S. government agencies        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 17,732 20,182    
Level 2 | Defined Benefit Pension Plan | Municipal bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 4,508 3,991    
Level 2 | Defined Benefit Pension Plan | U.S. agency mortgage-backed securities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [9] 252 269    
Level 2 | Defined Benefit Pension Plan | Asset-backed Securities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [10] 0 0    
Level 2 | Defined Benefit Pension Plan | Real estate        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [7] 0 0    
Level 2 | Defined Benefit Pension Plan | Balanced asset allocation        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 0 0    
Level 2 | Defined Benefit Pension Plan | Other        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [11] 0 0    
Level 2 | Defined Benefit Pension Plan Acquired | Cash equivalents        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets 0 0    
Level 2 | Defined Benefit Pension Plan Acquired | U.S. large cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [1] 0 1,360    
Level 2 | Defined Benefit Pension Plan Acquired | U.S. mid cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [2] 0 152    
Level 2 | Defined Benefit Pension Plan Acquired | U.S. small cap equities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [3] 0 72    
Level 2 | Defined Benefit Pension Plan Acquired | International        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [4] 0 735    
Level 2 | Defined Benefit Pension Plan Acquired | Corporate bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 407    
Level 2 | Defined Benefit Pension 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 | Defined Benefit Pension Plan Acquired | Municipal bonds        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [5] 0 0    
Level 2 | Defined Benefit Pension 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 | Defined Benefit Pension Plan Acquired | Asset-backed Securities        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [10] 0 743    
Level 2 | Defined Benefit Pension Plan Acquired | Real estate        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [7] 0 286    
Level 2 | Defined Benefit Pension Plan Acquired | Balanced asset allocation        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [8] 0 84    
Level 2 | Defined Benefit Pension Plan Acquired | Other        
Defined Benefit Plan, Categories of Plan Assets [Abstract]        
Total fair value of plan assets [11] $ 0 $ 231    
[1]
For the Plan, this category is comprised of individual securities that are actively managed and a broadly diversified “passive” mutual fund. The Acquired Plan assets in this category consist of pooled separate accounts invested in mutual funds and domestic stocks.
[2]
For the Plan, this category is comprised of broadly diversified “passive” mutual funds. The Acquired Plan assets in this category consist of pooled separate accounts invested in mutual funds and domestic stocks.
[3]
For the Plan, this category is comprised of broadly diversified “passive” mutual funds and shares of Southside Bancshares stock. The Acquired 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 Plan, this category is comprised of individual investment grade securities that are generally held to maturity. The Acquired Plan assets in this category consist of pooled separate accounts invested in investment grade and below investment grade bonds.
[6]
This category is comprised of a broadly diversified “passive” mutual fund.
[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 a pooled separate account invested in a single mutual fund invested in a combination of fixed income and equity investment options.
[9]
This category is comprised of individual securities that are generally not held to maturity.
[10] This category is mainly comprised of a pooled separate account invested in asset backed securities, residential mortgage backed securities, commercial mortgage backed securities and corporate bonds.
[11] This category is comprised of a pooled separate account invested in a broad range of instruments including, but not limited to, equities, bonds, currencies, convertible securities and derivatives such as futures, options, swaps and forwards.