Oregon Revised Statutes Financial Institutions § 708A.490

An insured institution may pay any sums in a joint account, on request, to any party without regard to whether any other party is incapacitated or deceased at the time the party demands payment. An insured institution may not pay the personal representative or heirs of a deceased party unless proofs of death are presented to the insured institution showing that the decedent was the last surviving party or unless no right of survivorship exists under ORS 708A.470.