@Michael ******
More complicated than I expected. I used Krung Thai when employed by a Thai university (KTB required by the university for direct deposit of pay). Then *after* that job ended I opened a second savings account at Bangkok Bank, and I think they requested only Passport and nothing else (but, then, I speak fluent Thai, and sometimes people give me a "pass" on the more normal details, so other people's experiences may be different.