1. Banks: Choosing a bank to get the mortgage is an obvious choice for many because nothing can be a more reliable option than a banking institution when you are dealing with your finances. Banks are the most common source for lending and financing. However, the banks in Australia are regulated by the Australian Prudential Regulation Authority (APRA) and have set some standards to allow the credit facilities. The banks as a financial institution take deposits from their regular customers in return for a suitable interest rate for the period of deposit.