Update 9/5/2024. I am now listing multiple accounts within a bank object rectangle in my diagram — for a few accounts. E.g. a line for checking and a line for savings. I put the approximate balances in K dollars on each line. Sometimes I might have to make the rectangle larger to accommodate three accounts within the same bank. For CD account dollar amounts I use a very faint orange instead of the typical orange font color, since this money isn’t as liquid. See towards end of document for screenshot of what I am talking about.
In this bank account bonus hunting hobby, I found by having a large number of bank & brokerage accounts open at any given time it can become quite unmanageable unless I have a few things in place. However with all the above, one thing I was missing was a diagram of how all the bank accounts are linked together.