Oregon Revised Statutes Financial Institutions § 707.646

(1) If there are six or more directors, the articles of incorporation or the bylaws may provide for staggering their terms by dividing the total number of directors into two or three groups, with each group to be as nearly equal in number as possible. In that event, the terms of directors in the first group expire at the first annual meeting after their election; the terms of the second group expire at the second annual meeting after their election; and the terms of the third group, if any, expire at the third annual meeting after their election. Thereafter, directors shall be chosen for a term of two years or three years, as the case may be, to succeed those whose terms expire.

(2) If the institution or Oregon stock savings bank has cumulative voting, terms of directors may be staggered only if authorized by the articles of incorporation, and no class shall have fewer than three members.