Mont. Code § 32-1-413
Notwithstanding any other provision of law, any commercial bank, savings bank, trust company, or investment company, now in existence or which may be hereafter formed, shall have the power to borrow money for capital purposes upon such terms and conditions as may be approved by the department and for this purpose may issue capital notes or debentures therefor, such notes or debentures to be subordinate in right of payment to the payment in full of all deposits of such bank, savings bank, trust company, or investment company. The amount of money so borrowed shall be considered as capital for the purpose of determining the maximum amount of money that may be loaned by such bank, savings bank, trust company, or investment company to any person, partnership, or corporation and for the purpose of determining the maximum amount of money which such bank may borrow and for all other purposes of bank capital as may be required by law.
§ 32-1-413, MCA