In my view, this measure was put in place to protect each customer’s account from every form of fraud or possible mix up. The bank also owes its customer an unalloyed duty of confidentiality not to disclose these information to third parties and any breach of these duties could give rise to liability in damages if loss results. This duty arises between a banker and customer upon the opening of an account and continues beyond the time when the account is closed. See UBA v. Corporate Affairs Commission & Ors (2016) LPELR-40569 (CA); Christofi v. Barclays Bank Plc. (2000) 1 WLR 937. … It is not in dispute that the relationship between the Appellant and the Respondent was that of Banker and Customer. The Bank therefore owes the Respondent a duty to exercise high standard of care not only in managing the Respondent’s monies but also his information and details which are in its custody. See Mainstreet Bank Ltd v. Juumanwin Nig. Ltd. (2013) LPELR-21855 (CA); Agbanelo v. UBN (2000) 4 SC Pt. 1 Pg 243.
— H.M. Ogunwumiju, JCA. First Bank v Oronsaye (2019) – CA/B/335/13