Hermeneutic: Banks

Deleuze refers to the term 'banks' without defining what he means. While the word 'banks', unlike 'dividuals', is a commonly understood word, by using quotations and italics Deleuze indicates that he means an alternative definition for the word. What, then, does he mean by 'banks' in this context? How does the word 'bank' as we might normally understand it have to do with samples, data, and markets?