I would have to agree with LincolnPirate and mozaismyhero.
Islamic banks are back door RIBA. They could not get the faithful from the front door of the commercial banks so they created something called Islamic banks.
Looking from the start, In essence the entire monetary system is Haram. So when you realize that all that is built is on Haram foundation then Islamic banks fall under the same category. I don’t want to go into the lecture to proof this but some thoughts and investigation for all the righteous people.