v3.26.1
RELATED-PARTY TRANSACTIONS (Details) - EBP 002 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Investments, at fair value $ 77,346,738 $ 65,683,914
Southside Bancshares, Inc. Common Stock    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Investment, number of shares (in shares) 114,791 110,016
Investments, at fair value $ 3,488,490 $ 3,494,096