That ... sounds like it violates every bank's ToS out there, and not the abusive buried-in-fine-print part, either. Every bank could, quite reasonably, cut off your access for this.
It's worse than that. Sharing passwords with third-parties typically "voids the warranty." If money is stolen from your account, the bank can deny reimbursing you because giving a third-party your password voids their zero-liability guarant guarantee.