BBVA are offering free Banking accounts to residents and non-resdents. It is all online. It is very simple to switch over, you need your TIE or passport and a full face picture to upload when you complete the online application form.  The last stage of the application is a videocall to the bank, where you are asked to show the TIE or passport and your own face. If they need any documents, it says they send a courier to collect them (but we were not asked for any).

BBVA will manage the switch