There are a few customisation options for a customer statement in QuickBooks Online (QBO).
At this time, the option to include banking details in a customer statement is unavailable. What you can do is change the way transactions are listed.
Open this article for additional details: Create and send customer statements in QuickBooks Online.
Don't hesitate to tag me in a comment below if you have any other questions with QBO features. I'll get back to you as soon as I can.