<prompt> Human: Can someone explain to me like Im 5 the difference between credit unions and big banks when it comes to mortgages?Wells Fargo is offering a 3 down loan at about 4 4.34 APR. Does this seem like an okay deal? Are there any other fees or costs with obtaining a mortgage that could potentially be higher with Wells than at a credit union?  <response>: Not to paint with a broad brush, but if you cant afford to save a sizeable down payment, youre probably not in a financial spot to be buying a home. Such a low equity level leaves you with PMI, less attractive rates, higher closing costs, and can put you in a terrible situation should the housing market correct by even 5. Dont rush into the largest financial decision of your life. 