MountainOne Bank (former Hoosac Bank) is a commercial bank that provides a wide range of banking services to private and corporate clients in Massachusetts from the Berkshires to the South Shore. The Bank operates two divisions: South Coastal Bank and Williamstown Savings Bank. Total assets: US$ 494 million (as of June 30, 2013). MountainOne Bank is a part of MountainOne Financial Partners, Inc. which offers banking services, customized insurance products, and comprehensive investment management with more flexibility.