A. Subject to the provisions of subsection L of section one hundred eighty-eight, the board of managers may, from time to time, increase or decrease the number of managers within the limits prescribed by subsection A of section one hundred eighty-eight; provided, that, except to the extent permissible pursuant to subsection I of section one hundred eighty-eight, (1) the number of managers after such increase or decrease shall be a multiple of three, and (2) such increase or decrease shall not create a disparity between the numbers of members in the several classes.
B. A copy of the resolution changing the number of managers, certified by two officers of the savings bank, shall be filed in the department within fifteen days after its adoption.