narrow bank
n.—Gloss: A bank that handles only basic banking and does not get involved in complex investment programs. «Jon Molton made the point in arguing for “narrow banks”—institutions that just do basic banking. “Transparency doesn’t cut it for me,” he said. “There’s not one person in this room that could read HSBC’s accounts and understand them.” That must have made a few wince.» —“The Sketch: Four million reasons why they did not see it coming” by Simon Carr Independent (London, England, United Kingdom) Jan. 14, 2009. (source: Double-Tongued Dictionary)