Idriana is a level 45 banker located in The Temple Gardens in the night elf city of Darnassus. It can be noted that Idriana is the only one of the 3 bankers in Darnassus that asks if you would like to open your deposit box. The other two tellers simply open your bank screen. This may have to do with her part in .
See List of Darnassus NPCs.