(a) The board of directors shall, by appointment from among the credit union members, fill any vacancies occurring on the board for the remainder of the director’s unexpired term or until a successor is elected and qualified following completion of the term filled by the board. In the event the vacancy reduces the number of directors serving on the board to less than the statutory minimum set forth in subsection (1) of Section 20, then the board shall fill the vacancy no later than the next annual meeting of members or 90 days after the vacancy occurred, whichever occurs first. Upon written application to the Secretary, the board may request additional time in which to fill the vacancy. The application may be approved by the Secretary in his or her discretion. The board shall, by appointment from among the credit union members, fill vacancies in the membership committee, credit committee, and supervisory committees.
     (b) An office may be declared vacant by the board when a director or a committee member dies, resigns from the board or committee, is removed from the board or committee, is no longer a member of the credit union, is the owner of less than one share of the credit union, or fails to attend three consecutive regular meetings of the board without good cause.