There are historical reasons for the proliferation of the title- every city and town used to have their own bank or several. These were independent businesses, each one having a President and maybe a couple of Vice Presidents. When mergers and acquisitions happened and all these single branch banks got rolled up to mega corps they kept the nomenclature because that’s what people were used to- a manager at a bank branch was a Vice President because that’s what it always meant, but the title then got used for anyone at the same level.

I’ve also heard that at least at some point the title “vice president” carried some form of regulatory meaning and was the minimum level required for sign off on some pretty basic things, but I’m having trouble confirming that and it may be wrong.