Mont. Code Ann. § 32-2-1015

32-2-1015 . Notice to creditors of insolvent mutual association. (1) Except as provided in subsection (2), the department shall give notice by advertisement once a week for 2 successive weeks in a newspaper of general circulation in the town or city where the mutual association is located, if there is one, or in another newspaper that is published in the state and designated by the department. The notice must call on all persons who have claims against the mutual association to present them to the department or its authorized agent at a place specified in the notice and to make sworn proof, in a form to be fixed by the department, within the time specified in the notice, not less than 90 days after the date of the first publication. A copy of the notice must be mailed to all persons whose names appear as creditors on the books of the mutual association.

(2) If the federal deposit insurance corporation is appointed as the liquidating agent, the provisions of subsection (1) do not apply and notice to creditors must be given pursuant to federal law.