This is a State law issue. Not all States allow tenancy by the entirety and it usually is only available for spouses.
Basically, if a bank account is a tenancy by the entirety account, a single spouse may not transfer money from the account without the consent of the other spouse. Tenancy by the entirety is more commonly used to hold title to real property rather than deposit accounts.
When a bank account is held as joint tenancy with right of survivorship, any joint owner can transfer funds out.
In either case, the remaining funds or property transfer to the survivor(s).
For additional specifics in your State, you need to sit down with your legal counsel.