Oregon Revised Statutes Financial Institutions § 708A.415

(1) An Oregon commercial bank may secure any of the funds deposited with the Oregon commercial bank by giving a surety bond, an irrevocable letter of credit issued by an insured institution, as defined in ORS 706.008, or a policy of insurance under which some person other than the Oregon commercial bank becomes liable for deposits, provided that the aggregate face amount of the bonds, letters of credit and policies of insurance does not exceed 20 percent of the capital of the Oregon commercial bank.

(2) A depositor may insure any deposit if the Oregon commercial bank is not a party to the insurance and does not pay any premium or other charges.