How much money do you need in the bank to get residency in Spain?

Could you please enlighten me on the financial requirements for obtaining residency in Spain? Specifically, I'm interested in knowing the amount of money one needs to have in their bank account to meet the criteria. Could you provide an estimate or a range of figures that would be sufficient for this purpose? Also, is there a specific type of bank account or financial institution that is preferred by the Spanish authorities for this type of application? I would appreciate it if you could clarify these points for me.