Oregon Constitution Art. XI § 3

The stockholders of all corporations and joint stock companies shall be liable for the indebtedness of said corporation to the amount of their stock subscribed and unpaid and no more, excepting that the stockholders of corporations or joint stock companies conducting the business of banking shall be individually liable equally and ratably and not one for another, for the benefit of the depositors of said bank, to the amount of their stock, at the par value thereof, in addition to the par value of such shares, unless such banking corporation shall have provided security through membership in the federal deposit insurance corporation or other instrumentality of the United States or otherwise for the benefit of the depositors of said bank equivalent in amount to such double liability of said stockholders.