v3.26.1
RELATED-PARTY AND PARTY-IN-INTEREST TRANSACTIONS (Details) - EBP 002 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Total investments, at fair value $ 375,447,055 $ 338,375,101
Notes receivable from participants $ 5,237,113 $ 4,847,656
Eastern Bankshares, Inc. common stock    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
EBP, investment, number of shares (in shares) 2,452,230 2,754,198
Total investments, at fair value $ 45,194,604 $ 47,509,917