CFSB Bancorp Inc provides banking services. It offers a variety of financial services to individuals and small businesses through its offices in Quincy, Holbrook, and Weymouth. Its primary deposit products are savings, checking, and term certificate accounts, and its primary lending product is residential mortgage loans.The Company's loan portfolio includes residential real estate, commercial real estate, construction, and consumer loan segments. Residential real estate loans include classes for one- to four-family, multi-family, second mortgages and home equity lines of credit.