The term "commercial bank" means any bank authorized by law to: (1) receive deposits of money; (2) deal in commercial paper or make loans on commercial paper; (3) lend money on real or personal property; (4) engage in business activities directly or indirectly through affiliates or subsidiaries; (5) discount bills, notes, or other commercial papers; and (6) buy and sell securities, gold and silver bullion, foreign coins, or bills of exchange.
Commercial Bank Defined
Mont. Code Ann. § 32-1-105, under General Provisions -- Definitions.
Mont. Code Ann. § 32-1-105