Great Western Bank Great Western Bank (NYSE: GWB) is a relationship-focused Commercial bank with Agribusiness expertise, partnering with Retail and leveraging our business partners.   Great Western Bank Service Telephone Contact Us: 1.800.952.2043 Click here for more info. Online Banking Login How to Log In 1. Visit the bank’s website https://www.greatwesternbank.com/.   2.  The  Login is located to the upper right part of their page. Enter Username and Password.   How to Enroll 1. Click the Not enrolled? Sign up now.…