Mont. Code Ann. § 72-6-224
Payment to designated agent
72-6-224 . Payment to designated agent. A financial institution, on request of an agent under an agency designation for an account, may pay to the agent sums on deposit in the account, whether or not a party is disabled, incapacitated, or deceased when the request is made or received and whether or not the authority of the agent terminates on the disability or incapacity of a party.