Many banks and credit unions have realized that budgeting in Excel does not provide the modeling capability that a software program offers - nor the accuracy. In today's environment, it's important to import all the loans, CDs and securities to accurately calculate interest income and interest expense going forward. The term used in the industry is "instrument level processing".
We specialize in the Vantage budget package from Fiserv and recommend it. We help with installations and after-the-fact training and support.