Wife is a banker for many years.
People with account access (tellers, bank managers, loan officers, customer service people, etc) can typically pull up any account they want any time they want. There are typically UID and time stamps associated with actions/changes made to accounts but from what I understand not always with viewing.
Looking at and/or working on a family member's account is forbidden at my wife's bank, as is servicing your own account. So my wife cannot service our accounts, which trust me, is fine, you would never want to do it even if it were allowed with as much scrutiny as the banking industry is under.
Keep in mind that only purchases you make electronically have anything associated with them. You can always pay in cash.