Can a credit union chartered in another state do business in the State of Arizona?  If so, who is their regulator?

Yes, the regulator is located in the state that issues their permit.  To see a list of out-of-state state chartered credit unions and more information about who regulates credit unions see the Other Regulator Referral List.

Can a credit union chartered in another state do business in the State of Arizona?  If so, who is their regulator?