So far, across the world 55 bank executives and CEOs have resigned due to various circumstances such as scams, personal scandals and harsh austerity measures imposed by the International Monetary Fund. The full list of those who have either resigned or announced plans to resign from such positions so far is contained in the link below, as are the sources for more information regarding each story.
http://americankabuki.blogspot.co.nz/2012/02/world-banker-resignations-total-55.html