TISA (Reg. DD) is likely your biggest concern here, as Ted noted. But you may check and see if any of your state's laws will apply as well, and any terms in your deposit agreement.
In a nutshell, you have to what the account types are, how they were disclosed and that will influence whether or not a 30 day notice is required under TISA.
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Andy Zavoina
Opinions stated are not necessarily that of my employer.