I bank at Natwest.com (http://natwest.com) and have been playing with other bank websites - some good, some not so good. I just wondered, in relation to your bank, how good is this site?
While my credit union also fails on this, I'm not a fan of drop-down menus for navigation. The gold standard for UX/UI as far as banking is concerned is Simple. https://simple.com/
This website fails completely in IE8. In fact, it gives error saying not supported and must use Google Chrome ? That could be fine for a new hotshot HTML5 app but if you are a bank, you better work with IE.
Probably just for historical reasons. The size of the layout is small enough to fit on a 1024x768 display. When that was the primary resolution targeted by web developers, they tried to cram everything into the top left corner, as this does.
FWIW, my credit union's website isn't too bad. They've started to redesign and use newer web technologies and approaches. https://www.americafirst.com/
One site I like a lot for banking is https://www.capitalone360.com. Really like their UI/UX.