Mont. Code Ann. § 33-4-402

All liability of the members of a farm mutual insurer must be as limited in the insurer's bylaws. For insurers transacting business on the cash premium plan, the limitation must comply with 33-4-504 (4). A member may not be required to pay more than the full amount of the member's obligation given to the insurer or of the member's liability as provided for in the bylaws.