BSB Bancorp is the holding company for Belmont Savings Bank, a community back with about half a dozen branches in southeastern Middlesex County in the suburbs of Boston. Serving local businesses and individuals, the $2 billion-asset bank offers checking, savings, money market, retirement accounts, and a variety of lending products. Almost 50% of its loan portfolio is made up of one-to-four family residential mortgages, while commercial real estate loans make up another 30%. While Belmont Savings Bank traces its roots back to 1885, BSB Bancorp was formed in 2011 to take the company public.