NBT Bank Online Banking NBT Bank started in 1856 in Norwich, New York where it is still headquartered. It has more than 90 branches all over New York. Customer Service Telephone 1 (800) 628-2265 Online Banking Login How to Log In 1. Go to www.nbtbank.com. 2. Find the log in area and select the account type under the Account Log In section. Choose your account type:  NBT Online banker  eStatements  StrataWeb  NBT Daily 401(k) service …