The bank opened on May 8, 2009, and the stock market was introduced in the bank on August 11, 2015.
The bank exchange rate was the following:
There was also a link available that took you to the "Buy YoCash" page.
When the stock feature was brought into Yoworld, the inside of the bank was replaced with the stock market popup window.
Exclusive Concept Art
Below are four original artworks of The Bank, back before the game's release. The second image bears the closest resemblance to the final design. The images are courtesy of Big Viking Games and are dated January 20, 2008.