Yes, I believe it would be considered personally identifiable information. Reg P, 1016.3(q)(2) states examples of non-public personal information as:
(2) Examples. (i) Information included. Personally identifiable financial information includes:
(A) Information a consumer provides to you on an application to obtain a loan, a credit card, a credit union membership, or other financial product or service;
(B) Account balance information, payment history, overdraft history, and credit or debit card purchase information;
(C) The fact that an individual is or has been one of your customers or has obtained a financial product or service from you;
(D) Any information about your consumer if it is disclosed in a manner that indicates that the individual is or has been your consumer;
(E) Any information that a consumer provides to you or that you or your agent otherwise obtain in connection with collecting on, or servicing, a loan or a credit account;
(F) Any information you collect through an internet “cookie” (an information collecting device from a Web server); and
(G) Information from a consumer report.
Also consider FFIEC information security requirements. Here’s a link to electronic transmission of information.
https://ithandbook.ffiec.gov/it-booklets/information-security/ii-information-security-program-management/iic-risk-mitigation/iic13-control-of-information/iic13(b)-electronic-transmission-of-information.aspx