Normally a term used by Private Banks to refer to Liquid Assets that are custodied on the banks platform. Most Private Banks use Mortgages as a way to do further business with a customer, and will have a minimum AUM threshold to qualify as a client of the bank and / or for a Mortgage. The amount can be a set figure, or a percentage of the mortgage amount; e.g. 25%. If they do not require AUM as part of the mortgage this commonly known as a Dry Lend.