A friend walks into the bank, and asks to buy $200 US with €'s. He lives on the island all year round and needed some dollars.
However they turn him away as they do not know him - You see he is not their customer. He asks why they are exchanging cash for strangers (Tourists) for € - "That is different" ...
So on to - Bank no 2
"Go to your own bank - we have no foreign money" (Surprising)
So on to - Bank no 3
His own bank, he is a customer - "Go away and come back in two hours"
Welcome to fiscal tightening of belts, or Island based currency controls - whichever you prefer ...