Is it permissible to withdraw the principal from the usurious profits of a bank that deals with usury, and then leave the principal with the bank, knowing that the profits will be in the name of the shareholder?

Participation in usurious banks is forbidden (haram (definition)), and whoever does so knowingly is sinful. If one does not know, then there is no sin upon him. In both cases, the partnership must be dissolved, and the capital retrieved. If this is not possible and usurious profits have been distributed, then these profits must be disposed of in charitable ways, while the capital remains in the bank until the shareholder is able to retrieve it.