A bank letter is an official document from your bank that provides important information about your business' official bank account. I must provide the City the name of a new bank and any new bank or account routing information for the direct deposit to be made to the new bank or account.Complete our Universal Direct Deposit Form and give it to your employer or payer organization. You will need your account number. This is the home page for the Bank of Houston. Get updates on our highlighted products and promotions and sign into eBanking from the top of the page. You are free to open a banking account at any bank of your choosing. In deciding on a bank, keep in mind that banks offer a variety of accounts. Opening a Unit Checking Account. Every unit will eventually need to have a checking account.