Find updated sign-up bonuses and other promotions from WaterStone Bank here. Typical offers in the past have been for $200 and $250 bonuses. Established in 1921 and headquartered in Wauwatosa, Wisconsin, WaterStone Bank has around 13 locations throughout the state. WaterStone bank offers all the traditional deposit accounts, with Checking, Savings, Money Market, CD and […]