Yes. I've just made a deposit to get back to the 800k , and they (krungsri) wanted my passport.
Weird because a while ago they didn't even asked it for a withdraw.
They look in the passport and type something in their computer , probably passport number.
Another reason to avoid banks. Hope to cut it down to 3 visits a year , one to top up to 800k, one to get the papers for extention,
then take everything out to just over 400k.