There are three main banks close to the main square in Puno, including the Canadian Scotiabank, all of which have functioning ATMs that allow you to withdraw solés at any hour.  Some common sense is advised, however, and you should be cautious about withdrawing cash after dark, particularly when there are no police or guards in the vicinity. ScotiaBank, on Deustra and Jiron Lima, is right across the street from Puno's official tourist information office. Just a short walk away is where you will find, on Jiron Lima and Grau, the Banco Credito de Peru (BCP), as well as InterBank.