RCW 48.09.130: Bylaws.

A domestic mutual insurer shall adopt bylaws for the conduct of its affairs. Such bylaws, or any modification thereof, shall forthwith be filed with the commissioner. The commissioner shall disapprove any such bylaws, or as so modified, if he or she finds after a hearing thereon, that it is not in compliance with the laws of this state, and he or she shall forthwith communicate such disapproval to the insurer. No such bylaw, or modification, so disapproved shall be effective during the existence of such disapproval.