I have lived in Thailand for more than 30 years and maintained my Westpac account in Australia (yes, I informed them of my Thai address). You shouldn't have any problems.
I made my point - you are obviously feeling rejected and are letting out your anger on social media and looking for somebody to care about you. Are you feeling any better yet?
I believe what Brandon is saying is that there must be some form of immigration office on the island or international ferries with passengers would not be able to land there.