(3) A credit union may add additional groups not to exceed one hundred potential members to its field of membership, from time to time, provided such groups can reasonably be served by one of the credit union's service facilities, such group having provided a written request for service to the credit union, and does not presently have credit union service available. However, the Board of Financial Institutions may revoke the power of any credit union to add groups under this provision upon a finding that permitting additions under this provision are not in the best interest of the credit union. The adding of such groups shall be consistent with the following:

1. (a) In order to add such additional groups, a credit union must first obtain a letter on the group's letterhead, where possible, signed by an official representative identified by title, requesting credit union service and stating that the group does not have any other credit union service available from any source. The groups must indicate the number of potential members seeking service. This document must be maintained by the credit union permanently with its bylaws.
2. (b) A credit union adding such groups must maintain a log of groups added. The log must include the following: the date the group obtained service, the name and location of the group, the number of potential members added, the number of miles to the nearest main or branch office, and the date of the approval of such group by the board of directors.
3. (c) Upon complying with the above procedures, board approval shall not be necessary to add such groups with no more than one hundred potential members to a credit union's field of membership. Approval of the Board of Financial Institutions shall be obtained prior to the addition of groups in excess of one hundred.