Cal. Fin. Code § 1467
A commercial bank located in a place the population of which does not exceed 5,000 persons according to the most recent official federal or state census may act as agent for any fire, life, or other insurance company authorized to do business in California by soliciting and selling insurance and collecting premiums and may receive for such services such fees and commissions as may be agreed upon with the insurance company if the bank is engaged in such business on October 1, 1949, and is duly licensed under the Insurance Code, and may act also as the broker or agent for others in making or procuring loans on real property located within 100 miles of the place in which the bank is located and may receive for such services a fee or a commission if it is engaged in such business on October 1, 1949, and is duly licensed. In engaging in either of such businesses the bank shall comply with all rules and regulations of the commissioner relating thereto and shall not guarantee either the principal or interest of any loan procured by it as broker or agent or assume or guarantee the payment of any premium on insurance policies written through it as agent or broker or guarantee the truth of any statement made by an insured in filing an application for insurance.
Ca. Fin. Code § 1467