There's no way to view this in-game as it has been deleted, and probably will not be added back into the game in the near future, as it has been removed from the game either partially or entirely.
Not much is known about the bank, only that it is located under the map. The purpose of its existence is also unknown.
Many people speculate that it could be a way to buy cash with Robux or turn money. It is also thought that it may replace the monetary bar in the abilities menu.
The Bank is a well-done building with fancy pillars on the sides and a red carpet inside it, very similar to Kars' Cave. Outside The Bank, there's a Dollar Sign and a staircase that leads to the building.
This might be or might not be a reference in Diamond Is Unbreakable. After going to the bank to cash in their lottery ticket, Josuke, Okuyasu and Shigechi all find themselves in hot water when the bank employee wants to play greedy with their lottery ticket.