There is no problem with this, because there are no restrictions with respect to professions. Anyone in the world can publish. Many banks are already in ORCID's database and will be shown in a drop-down list when starting to type in "Bank of ...". If the name of an institution (or a bank in this case) is not in the list, just type the name in, add the city, select the country and click on Save. I tested it right now, adding the Bank of Bhutan to my biography (and of course, I deleted it immediately after the test).