In chapter 3 what does randy tell the head of the bank?

Randy complains that Edgar knows his brother's check is good, and that he endorsed it, but Edgar insists stubbornly that Mark does not have an account there and it would be bad banking practice for him to hand Randy 5,000 dollars cash and then wait for it to be cleared all the way from his bank in Omaha. When Randy threatens to go cash it somewhere else, Edgar recognizes that this could be good business lost, and he finally gives Randy the cash and demands Randy tell him why he needs it.