When you first open your bank you will see that you have 1 bank page of space to use. You can buy more bank pages by double-clicking the red arrow found in your last bank page. Refer to the following chart for the minimum level requirement and cost for each bank page:
Ragni Bank is the first Bank that is encountered by new players. It is located at the west end of Ragni, near the king's castle. It is also one of the only banks that features instruction signs, the other being the Bank of Detlas.
Detlas Bank is located near the middle of Detlas. Below the bank is the Detlas Emerald Vault, entry to which is granted during the Jungle Fever quest. This is one of the only banks that features instruction signs and a trash can to throw away useless items.
Almuj Bank is located on the eastern side of the city, and may be entered from the front or back using long, wide staircases. The Bank is not accessible until the A Sandy Scandal quest has been started.
Rymek Bank is found on its own little "island" in the center of the town. Rather than having Emerald Merchants, the bank has Rymek Dealer Merchants that trade emeralds for the town's currency, Gold Ingots.
Craftmas Island Bank can be found following a short staircase by the east end of the island's dock. It's the smallest bank in the game both in size and amount of merchants.
The Temple of the Legends Bank is found in the right side of the temple. It has one of the nine Liquid Emerald Merchants, and also is one of the only banks not located within a town.
The Legendary Island Bank can be found in the area to the right of the island's temple. A bank is also accessible within the temple in between battles.
Trivia
Before the 1.12 update, VIP players used to receive 50% additional bank space to store items.
Many non-town locations have banks as well, including The Temple of the Legends, Guild Hall, the Update Room, and many others.
The banks with the most emerald merchants are Olux’s and Nemract’s. Ironically, these two towns are both noted to be very poor and poverty-stricken.
The largest bank buildings are those of Llevigar and Almuj.