FWIW.... we went through this exact same issue with webOS a few years ago. I bookmarked the BoA website and it worked exactly like the app... BUT, that makes it even more sucky that a banking service won't support an app that is simply a portal for their website.
As an outsider, I totally understand when a company stops supporting an app for a operating system (like webOS) when the OS developer shuts down development, but for banks to do this on a strong OS like Windows makes no sense to me. None. I truly feel the community's anger and confusion.... we at webOS Nation went through it too, but our excuse was HP killing the OS. I don't understand what these banks excuses are....