D. Oklahoma securities as used in this section shall mean real estate in this state, bonds of the State of Oklahoma, bonds or interest-bearing warrants of any county, city, town, school district or municipality or subdivision of the State of Oklahoma, notes or bonds secured by mortgages or other liens on real estate located in the State of Oklahoma, cash deposits in regularly established national or state banks, Federal Savings and Loan Associations, Federal Savings Banks, or any institution insured by either the Federal Deposit Insurance Corporation or Federal Savings and Loan Insurance Corporation, in this state on the basis of the average monthly deposits throughout the calendar year, policy loans secured by the legal reserve on policies insuring residents of the State of Oklahoma, and any other Oklahoma property or securities in which by the laws of the State of Oklahoma such insurance companies may invest their funds. Provided, that if any insurance company, copartnership, association, interinsurance exchange, person, insurer, nonprofit hospital service and medical indemnity corporation, or health maintenance organization secures such a credit prior to such a holding, it shall, within ninety (90) days after the mailing thereto by the Insurance Commissioner of a registered notice of said holding and the amount of said credit, pay said amount to the Insurance Commissioner, and if it fails to do so it shall be the duty of the Attorney General to institute proceedings in the name of the State of Oklahoma on the relation of the Insurance Commissioner in a court of competent jurisdiction to collect said amount.