Bank letterhead; Account number; Routing number; Business name. Before calling them, I suggest talking to a manager in the branch.Opening a bank account usually takes time and consideration and we recommend doing a bit of research. A simple letter letting asking your organization to change from your old account to your new account and give them the new account number. A bank confirmation letter (BCL) is a correspondence between banks that confirms the existence of a valid line of credit to one of its customers. How to close a credit card account. Account Information Letter. Northfield Bank offers a full line of personal and commercial banking services to the Staten Island, Brooklyn and New Jersey community.