The successor in office for the time being of such bishop, vicar-general and pastor, respectively, shall by virtue of his office be the trustee of such church or congregation in place of his predecessor. The lay members shall hold office for one year, and the office of any such layman shall become vacant by his removal out of the limits of such church or congregation. When the office of any such layman becomes vacant in any manner whatsoever the vacancy shall be filled by appointment in the manner provided for the selection of the original lay members of such board of trustees.